Online Books by
Ernst Haeckel
(Haeckel, Ernst, 1834-1919)
Online books about this author are available, as is a Wikipedia article.
Haeckel, Ernst, 1834-1919: The Answer of Ernst Haeckel to the Falsehoods of the Jesuits, Catholic and Protestant, From the German pamphlet "Sandalion", and "My Church Departure": Being Haeckel's Reasons, as Stated by Himself, for His Late Withdrawal from the Free Evangelical Church (New York: The Truth seeker company, c1911), contrib. by Joseph McCabe and Thaddeus Burr Wakeman (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Anthropogenie; oder, Entwickelungsgeschichte des Menschen (third, revised edition, in German; Leipzig: W. Engelmann, 1877) (multiple formats at archive.org)
Haeckel, Ernst, 1834-1919: Die Welträthsel: Gemeinverständliche Studien über Monistische Philosophie (in German; Bonn: E. Strauss, 1899)
Haeckel, Ernst, 1834-1919: Die Welträtsel: Gemeinverständliche Studien über Monistische Philosophie (in German; Leipzig: A. Kröner, 1909) (Gutenberg text)
Haeckel, Ernst, 1834-1919, contrib.: Evolution in Modern Thought, also contrib. by J. Arthur Thomson, August Weismann, William Bateson, Gustav Albert Schwalbe, C. Lloyd Morgan, Harald Høffding, P. N. Waggett, J. B. Bury, and Célestin Charles Alfred Bouglé (Gutenberg text and page images)
Haeckel, Ernst, 1834-1919: The Evolution of Man: A Popular Exposition of the Principal Points of Human Ontogeny and Phylogeny (2 volumes; New York: D. Appleton and Co., 1897)
Haeckel, Ernst, 1834-1919: The Evolution of Man: A Popular Scientific Study (2 volumes in 1; London: Watts and Co., 1906), trans. by Joseph McCabe
Haeckel, Ernst, 1834-1919: The Evolution of Man: A Popular Scientific Study (2 volumes; London: Watts and Co., 1911-1912), trans. by Joseph McCabe
Haeckel, Ernst, 1834-1919: Freedom in Science and Teaching (New York: D. Appleton and Co., 1879), contrib. by Thomas Henry Huxley (Gutenberg text and page images)
Haeckel, Ernst, 1834-1919: The History of Creation: or, The Development of the Earth and Its Inhabitants by the Action of Natural Causes (2 volumes; New York: D. Appleton and Co., 1880), trans. by E. Ray Lankester
Haeckel, Ernst, 1834-1919: The History of Creation: or, The Development of the Earth and Its Inhabitants by the Action of Natural Causes (2 volumes; New York: D. Appleton and Co., 1887), trans. by E. Ray Lankester
Haeckel, Ernst, 1834-1919: Kunstformen der Natur (2 volumes, in German; Leipzig and Vienna: Bibliographisches Institut, 1904)
Haeckel, Ernst, 1834-1919: The Last Link: Our Present Knowledge of the Descent of Man (London: Adam and Charles Black, 1898), ed. by Hans Gadow
Haeckel, Ernst, 1834-1919: Last Words on Evolution: A Popular Retrospect and Summary (London: A. Owen and Co., 1906), trans. by Joseph McCabe
Haeckel, Ernst, 1834-1919: Les Énigmes de l'Univers (in French; Paris: C. Reinwald, 1902), trans. by Camille Bos (Gutenberg text)
Haeckel, Ernst, 1834-1919: Monism, As Connecting Religion and Science (London: Adam and Charles Black, 1895), trans. by J. Gilchrist
Haeckel, Ernst, 1834-1919: Natur und Mensch (in German; Leipzig: P. Reclam Jr., ca. 1912), ed. by Carl W. Neumann (Gutenberg text and illustrated HTML)
Haeckel, Ernst, 1834-1919: Natürliche Schöpfungsgeschichte: Gemeinverständliche wissenschaftliche Vorträge über die Entwickelungslehre im Allgemeinen und diejenige von Darwin, Goethe, und Lamarck im Besonderen (in German; Berlin: G. Reimer, 1868) (multiple formats at archive.org)
Haeckel, Ernst, 1834-1919: Report on the Radiolaria Collected by H. M. S. Challenger During the Years 1873-76 (published in 2 parts and and one plate set as the 18th Zoology volume of the H.M.S. Challenger scientific reports; 1887), trans. by William E. Hoyle
Haeckel, Ernst, 1834-1919: The Riddle of the Universe at the Close of the Nineteenth Century (New York and London: Harper and Brothers, 1905), trans. by Joseph McCabe
Haeckel, Ernst, 1834-1919: A Visit to Ceylon (third American edition; New York: P. Eckler, ca. 1911), trans. by Clara Bell (multiple formats at archive.org)
Haeckel, Ernst, 1834-1919: The Wonders of Life: A Popular Study of Biological Philosophy (New York and London: Harper and Brothers, 1905), trans. by Joseph McCabe
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Additional books from the extended shelves:
Haeckel, Ernst, 1834-1919: Alte und neue Naturgeschichte. Festrede zur übergabe des phyletischen Museums an die Universität Jena bei gelegenheit ihres 350 jährigen Jubiläums am 30. Juli, 1908, (Jena, G. Fischer, 1908) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The answer ... to the falsehoods of the Jesuits, Catholic and Protestant. From the German pamphlet "Sandalion" and "My church departure" ... (New York, 1911) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Anthropogenie; oder, Entwickelungsgeschichte des menschen. Keimes- und stammesgeschichte, (Leipzig, W. Englemann, 1891) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Anthropogénie; ou, Histoire de l'évolution humaine, leçons familières sur les principes de l'embroyologie et de la phylogénie humaines ... (Paris : Reinwald, 1877) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Anthropogénie; ou, Histoire de l'évolution humaine. Leçons familières sur les principes de l'embryologie et de la phylogénie humaines par Ernest Haeckel ... (Paris, C. Reinwald et cie, 1877) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Arbeitsteilung in natur und menschen-leben. (Leipzig : [s.n.], 1910) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Atlas der topographischen Anatomie des Menschen für Studierende und Ärzte, (Jena, Fischer, 1894), also by Karl Heinrich von Bardeleben (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Bartholomäus von Carneri's briefwechsel mit Ernst Haeckel und Friedrich Jodl, (Leipzig, K.F. Koehler, 1922), also by B. Carneri, Margarete Förster Jodl, and Friedrich Jodl (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Das protistenreich. : Eine populäre uebersicht über das formengebiet der niedersten lebewesen. Mit einem wissenschaftlichen anhange: System der protisten / (Leipzig : E. Günther, 1878) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Das system der medusen. Erster theil einer monographie der medusen. (Jena, G. Fischer, vormals F. Mauke, 1879-80) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Das Weltbild von Darwin und Lamarck; Festrede zur hundert jährigen Geburtstag-Feier von Charles Darwin am 12. Februar 1909, gehalten im Volkshause zu Jena. (Leipzig, Kröner, 1909) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Dei Welträthsel : gemeinverständliche Studien über monistische Philosophie / (Bonn : E. Strauss, 1900) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Der monismus als band zwischen religion und wissen schaft. Glanbensbekenntnis eines naturforschers ... (Leipzig, A. Krŏner, 1908) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Die Amphorideen und Cystoideen : beiträge zur Morphologie und Phylogenie der Echinodermen / (Leipzig : W. Engelmann, 1896) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Die heutige entwickelungslehre im verhältnisse zur gesammtwissenschaft. Vortrag, in der ersten öffentlichen sitzung der fünfzigsten Versammlung deutscher naturforscher und aerzte zu München am 18. september 1877 gehalten (Stuttgart, E. Schweizerbart's verlagshandlung (E. Koch), 1878) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Die lebenswunder; gemeinverständliche studien über biologische philosophie. (Stuttgart, A. Kröner, 1904) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Die Lebenswunder; gemeinverständliche Studien über biologische Philosophie. Ergänzungsband zu dem Buche über die Welträthsel. (Stuttgart, A. Kröner, 1905) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Die moderne Weltschauung und der mensch; sechs öffentliche Vorträge. (Jena, G. Fischer, 1906), also by Benjamin Vetter (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Die Natur als Künstlerin, nebst: (Berlin-Ch. : Vita, deutsches verlagshaus, [c1913]), also by Wilhelm Breitenbach (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Die naturanschauung von Darwin, Goethe und Lamarck. : vortrag in der ersten öffentlichen sitzung der 55. versammlung Deutscher naturforscher und aerzte zu Eisenach am 18. September 1882 gehalten / (Jena : G. Fischer, 1882) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Die Radiolarien. (Rhizopoda radiaria.) Eine; Monographie. (Berlin, G. Reimer, 1862-1888) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Die Tiefsee-Medusen der Challenger-Reise und der Organismus der Medusen. Zweiter Theil einer Monographie der Medusen. (Jena, G. Fischer, 1881) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Die Weltraetsel; gemeinverständliche Studien über monistiche Philosophie. Mit Nachtragen zur Begründung der monistichen Weltanschauung. (Leipzig A. Kröner, [1908]) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Die welträthsel [microform]. Gemeinverständliche studien über monistische philosophie. (Stuttgart, Kröner, [1903]) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Die Welträthsel; gemeinverständliche Studien über monistische Philosophie. (Stuttgart, A. Kröner, 1905) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Die welträthsel : Gemeinverständliche studien über monistische philosophie / (Stuttgart : [s.n.], 1905) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Die Welträtsel : Gemeinverständliche Studien über Monistische Philosophie / (Leipzig, A. Kröner, 1909) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Englands Blutschuld am Weltkriege. (Eisenach, O. Kayser, 1914) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Ernst Haeckel: Entwicklungsgeschichte einer Jugend. Briefe an die Eltern 1852-1856. (Leipzig, K. F. Koehler, 1921) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The evolution of man: (London, C. K. Paul & co., 1879) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Evolution of man; a popular exposition of the principal points of human ontogeny & phylogeny; (New York, D. Appleton and Company, 1892) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The evolution of man: a popular exposition of the principal points of human ontogeny and phylogeny. (New York, Appleton, 1920) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The evolution of man; a popular exposition of the principal points of human ontogeny and phylogeny. (New York, D. Appleton and company, 1879) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The evolution of man : a popular exposition of the principal points of human ontogeny and phylogeny / (New York : D. Appleton and company, 1887) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The evolution of man : a popular exposition of the principal points of human ontogney phylogeny / (New York : D. Appleton and Company, 1920) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The evolution of man : a popular scientific study / (London [England] : Watts, 1910) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Freedom in science and teaching. (London, Kegan Paul, Trench, Trübner & Co., 1892), also by Thomas Henry Huxley (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Freedom in science and teaching. (New York, D. Appleton and company, 1879) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Freie Wissenschaft und freie Lehre : eine Entgegnung auf Rudolf Virchow's Münchener Rede über "Die Freiheit der Wissenschaft im modernen Staat" / (Leipzig : A. Kröner, 1908), also by Heinrich Schmidt (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Freie wissenschaft und freie lehre. : Eine entgegnung auf Rudolf Virchow's Münchener rede über "Die freiheit der wissenschaft im modernen statt.". (Stuttgart, : E. Schweizerbart, 1878) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Gemeinverständliche werke, (Leipzig, A. Kröner; [etc., etc., 1924]), also by Heinrich Schmidt (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Generelle Morphologie der Organismen : allgemeine Grundzüge der organischen Formen-Wissenschaft, mechanisch begründet durch die von Charles Darwin reformirte Descendenz-Theorie / (Berlin : G. Reimer, 1866) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Gesammelte populäre vorträge aus dem gebiete der entwickelungslehre. (Bonn, E. Strauss, 1878-79) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Gesammelte populäre Vorträge aus dem Gebiete der Entwickelungslehre. (Bonn, E. Strauss, 1878-79) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Gott-Natur (Theophysis) Studien über monistische Religion. (Leipzig, A. Kröner, 1914) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Histoire de la création des êtres organisés d'après les lois naturelles. (Paris, C. Reinwald, 1874), also by Charles Martins and Ch. Letourneau (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The history of creation or The development of the earth and its inhabitants by the action of natural causes. A popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular. From the 8th German ed. of Ernst Haeckel ... The translation rev. by E. Ray Lankester. (London, K. Paul, Trench, Trübner & co., ltd., 1906), also by L. Dora Schmitz and E. Ray Lankester (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The history of creation : or, the development of the earth and its inhabitants by the action of natural causes ; a popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular / (New York : D. Appleton, 1902) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The history of creation, or, The development of the earth and its inhabitants by the action of natural causes : a popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe and Lamarck in particular / (New York : D. Appleton, 1876), also by E. Ray Lankester (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The history of creation; or, The development of the earth and its inhabitants by the action of natural causes. A popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular. (London, Kegan Paul, 1884) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The history of creation : or The development of the earth and its inhabitants by the action of natural causes ; a popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular / (London : Kegan, Paul, Trench, Trubner, 1899) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The history of creation; or, The development of the earth and its inhabitants by the action of natural causes. A popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular. (New York, D. Appleton and company, 1883), ed. by E. Ray Lankester (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The history of creation or The development of the earth and its inhabitants by the action of natural causes. A popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular. From the 8. German ed. of Ernst Haeckel ... (London, K. Paul, Trench, Trübner & co., ltd., 1892), also by L. Tora Schmitz and E. Ray Lankester (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The history of creation or The development of the earth and its inhabitants by the action of natural causes. : A popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular. From the 8. German ed. of Ernst Haeckel ... / (New York : K. Paul, Trench, Trübner & co., ltd., Appleton, 1906 :, 1892), also by L. Tora Schmitz and E. Ray Lankester (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: India and Ceylon. (New York, J.W. Lovell Co., [c1883]), trans. by S. E. Boggs (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Indische Reisebriefe. (Berlin, Gebrüder Paetel, 1884) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Indische reisebriefe. (Berlin, Gebruder Paetel, 1883) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Indische Reisebriefe / (Leipzig : K. F. Koehler, 1922) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The last link : our present knowledge of the descent of man / (London : A. and C. Black, 1899), also by Hans Gadow (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Last words on evolution; a popular retrospect and summary, (New York, Eckler, [1905]) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Last words on evolution; a popular retrospect and summary, (New York, P. Eckler, [1906]), also by Joseph McCabe (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Last words on evolution; a popular retrospect and summary, (London, A. Owen & co., 1906), also by Joseph McCabe (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Last words on evolution; a popular retrospect and summary, (New York, P. Eckler, [1905]), trans. by Joseph McCabe (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Le monisme. Profession de foi d'un naturaliste, (Paris, Schleicher frères, [1905]), trans. by Georges Vacher de Lapouge (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Le règne des protistes aperçu sur la morphologie des êtres vivants les plus inférieurs suivi de la classification des protistes, (Paris, C. Reinwald, 1879), also by Jules Soury (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Les énigmes de l'univers. Comment se posent les énigmes de l'univers.--Origine et descendance de l'homme.--Développement de l'univers.--Commencement et fin du monde.--Croyance et superstition.--Science et christianisme.--Anathème du pape contre la science.--Fautes de la morale chrétienne.--État, école et église.--Solution des énigmes de l'univers. (Paris, Schleicher frères & cie, [1905]), trans. by Marie Boeuf (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Les preuves du transformisme : réponse a Virchow / (Paris : G. Baillière, 1879), also by Jules Soury (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Les preuves du transformisme : réponse a Virchow / (Paris : G. Baillière, 1882), also by Jules Auguste Soury (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Monographie der Medusen / (Jena : G. Fischer, 1879-1881), also by Challenger Expedition (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Natürliche schöpfungs-geschichte : Gemeinverständliche wissenschaftliche Vorträge über die Entwickelungslehre / (Berlin : G. Reimer, 1911) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Natürliche Schöpfungs-Geschichte; gemeinverständliche wissenschaftliche Vorträge über die Entwicklungs-Lehre. (Berlin, G. Reimer, 1898) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Natürliche Schöpfungsgeschichte. Gemeinverständliche wissenschaftliche Vorträge über die Entwickelungslehre im Allgemeinen und diejenige von Darwin, Goethe, und Lamarck im Besonderen ... (Berlin, Reimer, 1868) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Natürliche Schöpfungsgeschichte; gemeinverständliche wissenschaftliche Vorträge über die Entwickelungslehre im Allgemeinen und diejenige von Darwin, Goethe und Lamarck in Besonderen ... (Berlin, Reimer, 1870) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Natürliche Schöpfungsgeschichte. Gemeinverständliche wissenschaftliche Vorträge über die Entwickelungslehre im Allgemeinen und diejenige von Darwin, Goethe und Lamarck und Besonderen. (Berlin, G. Reimer, 1873) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Natürliche Schöpfungsgeschichte. Gemeinverständliche wissenschaftliche Vorträge über die Entwickelungslehre im allgemeinen und diejenige von Darwin, Goethe, und Lamarck im besonderen. (Berlin, G. Reimer, 1873) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Natürliche Schöpfungsgeschichte. Gemeinverständliche wissenschaftliche Vorträge über die Entwickelungslehre im Allgemeinen und diejenige von Darwin, Goethe und Lamarck im Besonderen. (Berlin, G. Reimer, 1889) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919, ed.: On the origin of language, (New York, L. W. Schmidt; [etc., etc.], 1869), by W. H. I. Bleek, trans. by Thomas Davidson (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Origine de l'homme. (Paris, Schleicher frères & cie, [1899?]), also by Léon Laloy (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-76. ([London, Eyre & Spottiswoode, 1887]) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The riddle of the universe. (London, Watts and Co., 1913), also by Joseph McCabe (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The riddle of the universe at the close of the nineteenth century, (New York, London, Harper & Brothers, 1900), also by Joseph McCabe (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The riddle of the universe at the close of the nineteenth century / (New York : Harper, 1902) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The riddle of the universe at the close of the nineteenth century / (New York ; London : Harper & brothers, [c1900]), trans. by Joseph McCabe (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The riddle of the universe at the close of the nineteenth century / (New York : Harper & Bros., 1905, c1900), trans. by Joseph McCabe (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The story of the development of a youth, (New York, London, Harper & brothers, 1923), trans. by G. Barry Gifford (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: The substance of The riddle of the universe, (New York, Vanguard press, 1927, c1926), also by Vance Randolph (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: Ueber unsere gegenwärtige kenntniss vom ursprung des menschen. Vortrag gehalten auf dem vierten Internationalen zoologen-congress in Cambridge, am 26. august 1898, (Bonn, E. Strauss, 1899) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Vahdet-i mevcud : bir tabiat âliminin dini / ([Istanbul] : Dersaadet Kütüphanesi, [1911?]), also by Ahmet Nebil and Baha Tevfik (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Világproblémák : népszerű tanulmányok a monisztikus filozófiáról / (Budapest : Vass József Könyvkiadóhivatala, 1905) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: A visit to Ceylon, (New York, P. Eckler, [1881?]), trans. by Clara Bell (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: A visit to Ceylon... (Boston : S. E. Cassino & Co., 1883) (page images at HathiTrust)
Haeckel, Ernst, 1834-1919: The wonders of life : a popular study of biological philosophy / (London : Watts, 1904) (page images at HathiTrust; US access only)
Haeckel, Ernst, 1834-1919: Ziele und wege der heutigen entwickelungsgeschichte. (Jena, H. Dufft, 1875) (page images at HathiTrust)
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