Volition absent where brain is absent, 287

Voluntary muscular contraction, brain the source of, 14
Vowel sounds, how formed, 198

W.

WALKING, mechanism of, 189

Walls of vessels, differing structure of, 24

Wandering cells, 326

Warmth, sense of, 208

Waste, in contraction of muscle, 149

nitrogenous, 146

as result of work, 3, 4, 15

Waste matter in blood, excretion of, 106

Waste products of work in tissues, not all useless, 107
Water, absorption of, by the large intestine, 167
excretion of, 3. 16, 107, 124, 148, 366

by kidneys, 112, 113, 117, 369

by lungs, 16, 87, 368

by skin, 119, 369

proportion of, in bile, 129

in blood, 72

Water-camera described, 253

eye-ball considered as, 257

Weight, proportional, of component parts of the body, 365
White matter of brain and medulla oblongata, 294 -
of spinal cord, 282

Winking, a cerebral reflex action, 3or-

Wisdom teeth, 347

Work, physiological, 2-5

estimate of, in foot-pounds, 366
waste a result of, 15

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