Occupation, 173 Orgeas, 157, 160 Osseous System, 133 Pascal, 5, 83 Pathology, 159 Permanence, 39 Personality, 11 Peruvian, 52, 71, 99, 134 Perversion, conditions of, 107 Pickering, 190 Plato, 24, 53 Polynesian, 114, 159, 162, 174, 187 Post, 11 Progression, arithmetical, 78 —geometrical, 80 —saltatory, 80 Progress, rate of, 77 Psychic Cells, 16 Quakers, 69 Quatrefages, de, 153 Quechuas, 92, 131 Quen, de, 112 Quetelet, 14, 40, 107 Rabelais, 144 Race, 33 Ranke, 87 Ratzel, 160, 180 Receptiveness, 59 Reibmayr, 155, 156 Remembrance, 52 Reproduction, 135 Ribot, 143 Romanes, 5 Rousseau, 72 Salubrity, 192 Schaffhausen, 123 Schmidt, 76 Seeland, 145 Self-consciousness, 10 Semites, 102 Sexual subversions, 90 Siam, 69 Siberians, 99, 113 Skull measurements, 128 _ff._ Soil, 188 Soul, 16 _ff._ Spinoza, 179 Steinthal, vii, 178 Stock, 33 Symonds, 115 Syphilis, 101 Tartar, 89, 191 Tasmanian, 159 Temperament, 143 Temperature, 192 Tibet, 92 Tiedemann, 127 Todas, 192 Toxic agents, 98 Tribe, 33 Tuaregs, 192 Tupis, 185 Van Brero, 12 Van Buren, 136 Variation, physiological, 46 —progressive, 49 —regressive, 64 —modes and rates of, 72 —parallel and divergent, 73 —in circles and curves, 75 —in waves, 77 —pathological, 82 —— etiology of, 85 Vierkandt, 23, 56 Vikings, 67 Virchow, 83 Vital Powers, 142 Waitz, 158 Weight, 134 Wordsworth, 184 Wundt, viii, ix, xi, xiii, 26, 28, 143, 181 [Illustration] The Science Series Edited by Professor J. MCKEEN CATTELL, Columbia University, with the coöperation of FRANK EVERS BEDDARD, F.R.S., in Great Britain. Each volume of the series will treat some department of science with reference to the most recent advances, and will be contributed by an author of acknowledged authority. Every effort will be made to maintain the standard set by the first volumes, until the series shall represent the more important aspects of contemporary science. The advance of science has been so rapid, and its place in modern life has become so dominant, that it is needful to revise continually the statement of its results, and to put these in a form that is intelligible and attractive. The man of science can himself be a specialist in one department only, yet it is necessary for him to keep abreast of scientific progress in many directions. The results of modern science are of use in nearly every profession and calling, and are an essential part of modern education and culture. A series of scientific books, such as has been planned, should be assured of a wide circulation, and should contribute greatly to the advance and diffusion or scientific knowledge. The volumes will be in octavo form, and will be fully illustrated in so far as the subject-matter calls for illustrations. G. P. PUTNAM’S SONS, NEW YORK & LONDON