Organic Evolution, consideration of problems of, 24–28. ----Factors in, 27. ----Cross-roads in, 203–205. Owen, Richard, 10. Oxen: Hair-patterns of, 87–91. Palm, skin of, 147–156. ----of Man, 155–156. Papillary ridges, some undersigned experiments in, 166–169. Paterson, Dr. C., 188. Pearson, Professor Karl, 34, 141, 142. Phalanger, epidermis of, 152. Pitt, Miss Frances, 94, 95, 251. Plantar arch, of man, 192–194. ----How it was built, 194, 195. ----Equipment of, 196, 197. ----Description of, 197–199. Plasto-diēthēsis, 34, 145, 195. Platysma, Struggles of the, 111–114. Playfair, 3. Pocock, Roger, 75. Poincaré, Henri, 157. ----Principles of method, 36. Porcupine, Canadian Tree, epidermis of, 151, 153. Poulton, Professor: “Essays on Evolution,” 86. Prescott’s “Conquest of Peru,” 120. Pressure, Examples of the effects of, upon hair-direction, 127–136. Primates, epidermis of, 153. Rabbit, epidermis of, 151. Records, Interpretation of, 110. Reflex arches, formation of, 231. ----Some historical illustrations of, 231–234. ----Of Insects, 236, 237. ----Of Mollusca, 236, 237. ----Of Birds, 236, 237. ----Evidence of production of new, 242–246. Reflexes: Stimuli of, 249–256. ----Scratch, of the dog, 249. ----Purposes of, 250–253. ----Scratch, of the cat, 253. Rivers, Sources of, 4. Romanes: 19, 39, 40, 145. ----On Weismann, 17, 18. Roux, 19, 145. Russell, The Hon. Bertrand, 142. Russell, E. S. On Lamarck’s theory, 20. Saint-Hilaire, Geoffrey, 10. Sapajou, Brown, papillary ridges on hand and foot of, 165. Schafer’s “Text Book of Physiology,” 219, 220, 226. Scratch reflex; of the dog, 249. ----Of the cat, 253. Selous, 92, 115, 118. Sherrington, Professor, 218, 226, 229, 238, 244, 245, 249, 250, 251, 253, 254. Skin, Human: Distribution of Touch Corpuscles, 219. ----Distribution of Touch Spots, 219. ----Distribution of Cold and Warmth Sensations, 220. ----Distribution of Cold and Warmth Spots, 220, 221. ----Stimuli of pressure, 222, 226–230. ----Stimuli of cold, 226–230. ----Stimuli of pain, 226–230. ----Stimuli of warmth, 226–230. Sloth, Two-toed (_Cholæpus didactylus_): Hair-patterns of, 122, 123. Smith, Dr. E. Barclay, 201, 216. Sole, skin of, 147–156. ----Of Man, 155, 156. Spencer, Herbert, 28, 177. Squirrel, epidermis of, 152. ----Papillary ridges on hand and foot of, 162, 166. ----Flexures of hand and foot of, 175. Squirrel-monkey, papillary ridges on foot of, 161. ----Flexures of foot of, 176. Starling, Professor, 227, 244. ----On Facilitation, 240, 246. Still-born children, subcutaneous bursæ of two, 183, 184. Stimuli, 30, 31. ----Of touch, 219, 226–230. ----Of cold, 220, 226–230. ----Of warmth, 220, 226–230. ----Of pressure, 222, 226–230. Stout, Professor, 252. Summary of conclusions arrived at, 257, 258.