GRANT ALLEN, The Colours of Flowers. A. C. ABBOT, Principles of Bacteriology. FRANK BAKER, The Ascent of Man. THOMAS BELT, Naturalist in Nicaragua. H. W. BATES, Naturalist of the Amazons. F. E. BEDDARD, Animal Coloration. A. H. BRADFORD, Heredity and Christian Problems. F. M. BALFOUR, A Treatise on Comparative Embryology. D. G. BRINTON, Races and Peoples. P. C. BURT, A History of Modern Philosophy. PAUL CARUS, The Soul of Man. PAUL CARUS, The Ethical Problem. PAUL CARUS, The Idea of God. PAUL CARUS, Homilies of Science. PAUL CARUS, Fundamental Problems. ARTHUR CLARKSON, A Text-Book of Histology. EDWARD CLODD, The Story of Creation. EDWARD CLODD, The Story of Primitive Man. EDWARD CLODD, A Primer of Evolution. CARPENTER-DALLINGER, The Microscope and its Revelations. A. DE QUATREFAGES, The Natural History of Man. E. D. COPE, The Primary Factors of Organic Evolution. CHARLES DARWIN, The Origin of Species. CHARLES DARWIN, The Descent of Man. CHARLES DARWIN, Animals and Plants under Domestication. J. D. DANA, New Text-Book of Geology. BASHFORD DEAN, Fishes, Living and Fossil. J. W. DRAPER, History of the Intellectual Development of Europe. J. W. DRAPER, Conflict between Religion and Science. H. H. DONALDSON, The Growth of the Brain. R. L. DUGDALE, The Jukes. HENRY DRUMMOND, The Ascent of Man. HAVELOCK ELLIS, Man and Woman. HAVELOCK ELLIS, The Criminal. JOHN FISKE, The Unseen World. JOHN FISKE, The Idea of God. JOHN FISKE, The Destiny of Man. JOHN FISKE, Excursions of an Evolutionist. JOHN FISKE, Myths and Myth-Makers. ENRICO FERRI, Criminal Sociology. SIR W. H. FLOWER, Osteology of the Mammalia. FUNK and WAGNALL, Standard Dictionary of the English Language. THEODORE GILL, The Families of Fishes. THEODORE GILL, Articles on Fishes in the Riverside Natural History. JOHN C. GALTON, Ecker’s The Human Brain. FRANCIS GALTON, Hereditary Genius. FRANCIS GALTON, Natural Inheritance. FRANCIS GALTON, English Men of Science, their Nature and Nurture. C. GEGENBAUR, Elements of Comparative Anatomy. J. M. GUYAU, Education and Heredity. GEDDES and THOMSON, The Evolution of Sex. HARPER’S Latin Dictionary. T. H. HUXLEY, Anatomy of Vertebrated Animals. T. H. HUXLEY, Man’s Place in Nature. T. H. HUXLEY, Origin of Species. T. H. HUXLEY and MARTIN, Practical Biology. T. H. HUXLEY, Science and Culture, and other Essays. HERTWIG-MARK, Text-Book of Embryology. DAVID J. HILL, Genetic Philosophy. HERTWIG-CAMPBELL, The Cell. ROBERT HARTMAN, The Anthropoid Apes. GEORGE HASLAM, Ecker’s Anatomy of the Frog. REV. W. HOUGHTON, Sketches of British Insects. E. KLEIN, Micro-organisms and Disease. G. T. LADD, Outlines of Physiological Psychology. CESARE LOMBROSO, The Man of Genius. SIR JOHN LUBBOCK, The Beauties of Nature. SIR JOHN LUBBOCK, Ants, Bees, and Wasps. ARNOLD LANG, Text-Book of Comparative Anatomy.