220.
Vital force, 318.
Van der Waal’s equation, 308.

W
Weber’s law, 16;
 a quasi-mathematical relation, 17.
Weismann, hypothesis of heredity, 182;
 hypothesis of germinal selection, 241;
 hypothesis of development, 132;
 mosaic-theory, 131;
 preformation hypothesis, 133;
 hypothesis of the germ-plasm, continuity of the germ-plasm, 181;
 germinal changes inconceivable, 224;
 size of biophors, 183;
 origin of life, 339;
 spontaneous generation a logical necessity, 339.
Weismannism, a series of logical hypotheses, 320;
 physico-chemical analogies, and subsidiary hypotheses, 223.
Whales, an unsuccessful line of evolution, 274.
Whitehead, and mathematical reasoning, 347.
Wilson, mosaic-theory of development, 139.

Y
Yerkes, and behaviour of crustacea, 293.

Z
Zymogens, 92.
Zymoids, 94.