ANALYSIS OP THE LESSONS. 



two days of incubation. 1236. The brain of the adult Stork described. 1237. 

 Description continued. 1238. Concluded. 1239. The brain of the Buzzard. 

 1240. Concluding remarks. 



LESSON LXXXVL NERVOUS SYSTEM IN MAMMALIA AND MAN, ... p. 276. 



1241. Condition of the nervous system in the lowest animals. 1242. Its 

 progressive development. 1243. Its condition in the lowest articulata. 1244. 

 Nervous system in the Leech. 1245. The brain increases in size, proportion- 

 ably with the increase of organs of special sense. 1246. The nervous system in 

 the bivalve-mollusca considered. 1247. Their brain examined. 1248. Higher 

 condition of the brain in the Testaceous mollusca. 1249. Transition to the 

 Fishes. 1250. The higher Fishes and the amphibious Keptiles considered. 

 1251. Ascent to the Mammalia. 1252. The function of commissures. 1253. 

 Analysis of the brain in the lower animals. 1254. Development of the Cerebro- 

 spinal axis of man. 1255. Continued. 1256. Subject continued. 1257. De- 

 monstrated. 1258. The demonstration continued. 1259. And concluded: 

 commentary. 



LESSON LXXXVII. NERVOUS SYSTEM OF MAMMALIA AND MAN, 



CONTINUED, p. 281. 



1260. Comparative size of the human spinal chord. 1261. The medulla 

 oblongata. 1262. The microscopical characteristics of nerve. 1263. The struc- 

 ture of a nerve. 1264. The " nerve fibres." 1265. Their composition. .1266. 

 The white substance. 1267. It easily dissolves. 1268. The axis-cylinder. 

 1269. Demonstration of it and the white substance. 1270. Axis-cylinder con- 

 taining white substance. 1271. Tubes of the median nerve (human) demon- 

 strated. 1272. The sympathetic nerve described. 1273. And demonstrated. 

 1274. The structure of ganglions. 1275. Ganglion corpuscles not confined to 

 ganglia. 1276. Structure of nervous matter in the animal kingdom. 1277. 

 Ganglion of the Cockroach. 



LESSON LXXXVni. NERVOUS SYSTEM IN MAMMALIA AND MAN, 



CONCLUDED, p. 285. 



1278. Vascularity of nerves. 1279. Nerves accompany arteries and veins. 

 1280. Character of the blood-vessels of nerves. 1281. Demonstration of them. 

 1282. Nerve from human pericardium. 1283. Blood-vessels of ganglions de- 

 monstrated. 1284. Their peculiarity. 1285. Concluding remarks. 



LESSON LXXXIX. ORGANS OP SPECIAL SENSE THE EYE, .... p. 287. 



1286. Introduction. 1287. The eye an optical instrument: demonstration. 

 1288. Requirements of a visual organ. 1289. Proof of the statement offered. 

 1290. Animals destitute of vision, who seek or shun the light. 1291. The 

 effect of light upon plants. 1292. Red spots in animals described as eyes. 

 1293. Their real nature. 1294. Fallacy of this doctrine. 1295. It is doubtful if 

 the Radiata possess eyes. 1296. But they exist in Articulata in Epizoa gen- 

 erally : in Cirripeds not at all. 



