in expired air at 470 parts in 10,000, such a body would require a supply per diem of more than 23,000 cubic feet of ordinary air, in order that the surrounding atmosphere might not contain more than 1 per 1,000 of carbonic acid (when air is vitiated from animal sources with carbonic acid to more than 1 per 1,000, the concomitant impurities become appreciable to the nose). A man of the weight mentioned (II stone) ought, therefore, to have at least 800 cubic feet of well-ventilated space. V. CUTANEOUS EXCRETION. Such a body would throw off by the skin-of water about 18 ounces, or 10,000 grains; of solid matters about 300 grains; of carbonic acid about 400 grains, in 24 hours. VI. RENAL EXCRETION. Such a body would pass by the kidneys-of water about 50 ounces; of urea about 500 grains; of other solid matters about 500 grains, in 24 hours. VII. NERVOUS ACTION. A nervous impulse travels along a nerve at the rate of about 80 feet in a second in the frog, and of about 100 feet a second in man; but the rate in man varies very much according to circumstances. VIII. HISTOLOGY. The following are some of the most important histological measurements : Red blood-corpuscles, breadth 7 μ to 8 μ. White blood-corpuscles, breadth 10 μ. th of an inch, or th of an inch, or Striated muscular fibre (very variable), breadthath of an inch, or 60 μ; length 1 inch, or 30 to 40 millimetres. Non-striated muscular fibre (variable), breadth oth of an inch, or 6 μ; length both of an inch, or 50 μ. B B. Nerve fibre (very variable), breadth of an inch, or 2 μ to 12 μ. th to th Nerve cells (of spinal cord) excluding processes, breadth both tooth or more of an inch, 50 μ to 100 μ or more. Fibrils of connective tissue, breadth both of an inch, or I μ. Superficial cells of epidermis, breadth inch, or 25 μ. Capillary blood-vessels (variable), width of an inch, or 7 μ to 12 μ. both of an th to gʊʊʊth Cilia, from the wind-pipe, length sath of an inch, or 8 μ. Cones in the yellow spot of the retina, width th of an inch, or 3 μ. INDEX. ABDOMEN (abdo, I hide), 5 Abdominal aorta, 106 Abduction (ab, from; duco, I lead), Absorption (ab, from; sorbeo, I suck up), from alimentary canal, 16, 103, 143 blood, 107 stomach, 161 Accommodation of the eye, 258 of oxygen, 73, 102, 133, 143 Acetabulum (a vessel for holding vinegar), construction of, 186 Acid, acetic, appearance of blood treated with, 65 connective tissue treated with, 323 carbonic, see Carbonic acid glycocholic, 129. hydrochloric, calcareous salts dissolved out of bone by, 330 lactic, 173 taurocholic, 129 uric, 113 Acid reaction of gastric juice, 157, 165 stiffened dead muscle, 172 urine, 112 Acids of the bile, 131 Action, reflex, of the brain, 301 continuance of, in brainless frog, 55, 287, 299 of the spinal cord, 287, 302 in coughing, 97 Acts, particular, connected with particular parts of brain surface, 300 "Adam's apple," 191 Adduction (ad, to, duco, I lead), 187 Adipose (adeps, fat), tissue, 328 Adjustment of the eye, how accomplished, 258 Aërial waves from sonorous bodies, 232 Afferent and efferent impulses, course of in cord, 289 in medulla oblongata, 298 nerves, 201, 284, 360 |