Social organization, 180; how best obtained, 182; its tendency to equalize conditions, 185; secures permanence among specialized individuals, 181 Social problems, 179 ff. Society, 179 ff.; centrifugal and centripetal forces in, 181 ff.; division of functions in, 181 Sociology, 47, 55, 57 Solar radiation, 169 Soul, the, 171 ff. Sound signs, advantage and disadvantage of, 89 ff. Sound writing, 33 ff., 92 ff. Space, four-dimensional, 77, note; homogeneity of, in horizontal direction, 121; the science of, 54; symmetrical and tri-dimensional, 118; time and, 118 ff.; tri-dimensional, 76 Specialization, one-sidedness of, 180 ff. Spelling reform, 97 Stable forms, 163 Statics, 128 ff.; definition of, 138 ff. Stationary bodies, capable of regeneration, 164 Stationary forms, 163 Substance, 132 Surface-energy, 146 Syllogism, the, classic method of argumentation, 65 ff. Synonym, 89 Table of the sciences, 54 ff. Telegraph, optical, 90 "Teleological" properties of organisms, 173 Teleological reaction, 173 Telescope, 5 Temperature, 148 Theoretical science, importance of, 15 Theory of functions, 111 Theory of numbers, 80 Thermo-chemistry, 37 Thermo-dynamics, 153 Thing, definition of, 62 ff. Thought conceived of as energetic, 178 Threshold, 102 Time, a form of inner life, 76; measurement of, 122; one-seried, or one-dimensional, 118; and space, 118 ff. Unambiguity, in language, 89; of co-ordination of numbers to signs, 90 Universal auxiliary language, 100, 183 Velocity, 133 Volume energy, 145 War, 185 Wave surface, 6 Wave theory of light, 5, 157 Weight, 132, 137 ff.; a substance, 138 Work, mechanical, 129; product of the force and the distance, 130; a substance in a limited sense, 136 Written language, 89 ff. Written signs, 90 Zoology, 56 * * * * * American Public Problems EDITED BY RALPH CURTIS RINGWALT IMMIGRATION: And Its Effects Upon the United States By PRESCOTT F. HALL, A.B., LL.B., Secretary of the Immigration Restriction League. 393 pp. $1.50 net. By mail, $1.65. "Should prove interesting to everyone. Very readable, forceful and convincing. Mr. Hall considers every possible phase of this great question and does it in a masterly way that shows not only that he thoroughly understands it, but that he is deeply interested in it and has studied everything bearing upon it."--_Boston Transcript._ "A readable work containing a vast amount of valuable information. Especially to be commended is the discussion of the racial effects. As a trustworthy general guide it should prove a godsend."--_N. Y. Evening Post._