Part 69

Weber, 108, 306.

Weight of bodies, varies with their distance from the centre of the earth, 112.

Weismann, 216.

Wheatstone, his stereoscope, 73; his pseudoscope, 96; also 59.

Wheel, history and importance of, 61 et seq.

Whewell, on the formation of science, 231.

Whole, the, 204, footnote.

Why, the question, 199, 223.

Will, Schopenhauer on the, 190; man's most familiar source of power, 243; used to explain the world, 186; forces compared to, 254; compared to pressure, 14.

Windmill, a rotating, 53.

Wire frames and nets, for constructing liquid figures of equilibrium, 4 et seq.

Witchcraft, 187.

Wollaston, 284, 285.

Wonderful, science the natural foe of the, 224.

Woods, the relative distance of trees in, 68.

Wooer, inquirer compared to a, 45.

Words and sounds, 343.

Words, compared to type, 191.

Work, of liquid forces of attraction, 14; in electricity, 173; measure of, 119 et seq., 130, 223; relation of, with heat, 162, 245 et seq.; amount required to develop electricity, 131 et seq.; produces various physical changes, 139; substantial conception of, 183-184. See Energy.

World, the, what it consists of, 208.

World-particles, 203.

Wronsky, 172.

Wundt, on causality and the axioms of physics, 157-159; 359 footnote.

Xenophon, 49, footnote.

Young, Thomas, on energy, 173.

Zelter, 35.

Zeuner, 171.

Zoölogy, comparison in, 239.