But it is unfair to think of Huxley even when young as a firebrand, though it is true that he was to some extent a man of war, and though the fierce and consuming mood is rather more prominent in his early writings than in his later work. A fighting attitude was inevitable forty years ago, because then the truths of biology were being received with hostility, and the free science and philosophy of a later time seemed likely to have a poor chance of life. But the world has changed or is changing now, the wholesome influences of fire have done their work, and it would be a rather barbarous anachronism to apply the same agency among the young green shoots of healthy learning which are springing up in the cleared ground. OLIVER LODGE. 1906. * * * * * Among the earlier published works of T. H. Huxley (1825-1895), and of the essays contained in this volume: "The Darwinian Hypothesis" first appeared in the _Times_, Dec. 26, 1859; "On the Educational Value of the Natural History Sciences" (Address given at St. Martin's Hall), was published in 1854; "Time and Life" (_Macmillan's Magazine_), Dec. 1859; "The Origin of Species" (_Westminster Review_), April 1860; "A Lobster: or, The Study of Zoology," 1861. "Geological Contemporaneity and Persistent Types of Life" (Address to Geological Society), 1862, was re-published in "Lay Sermons," vol. viii.; "Six Lectures to Working Men on the Phenomena of Organic Nature," 1863, in "Collected Essays," vol. vii. "Evidence as to Man's Place in Nature," 1863. Of his other works, the translation by Huxley and Busk of "Kölliker's Manual of Human Histology," appeared in 1853. "Lectures on the Elements of Comparative Anatomy," "Elementary Atlas of Comparative Osteology"; two Science Lectures, "The Circulation of the Blood" and "Corals and Coral Reefs," and "Lessons in Elementary Physiology," in 1866. "Introduction to the Classification of Animals," 1869. "Lay Sermons, Essays, and Reviews," 1870. "Critiques and Addresses," 1873. "On Yeast: A Lecture," 1872. "A Manual of the Anatomy of Vertebrated Animals," 1871. "Manual of the Anatomy of Invertebrated Animals," 1877. "American Addresses," 1877. "Physiography," 1877. "Hume" in "English Men of Letters," 1878. "The Crayfish: an Introduction to the Study of Zoology," 1880. "Science and Culture, and other Essays," 1881. "Essays upon some Controverted Questions," 1892. "Evolution and Ethics" (the Romanes Lecture), 1893. Huxley also assisted in editing the series of Science Primers published by Messrs. Macmillan, and contributed the introductory volume himself. The "Collected Essays," in nine vols., containing all that he cared to preserve, 1893. "The Scientific Memoirs of T. H. Huxley," edited by Professor Michael Foster and Professor E. Ray Lankester, in five vols., 1898-1903. His "Life and Letters," edited by his son, Leonard Huxley, was published in 1900. [Illustration: _Skeletons of the_ GIBBON. ORANG. CHIMPANZEE. GORILLA. MAN.