10 Contents 



II. Animals: p. 15S. Protozoans, p. 159. The lower invertebrates, p. 163. 

 Arthropods, p. 183. Insects, p. i95- Vertebrates, p. 231. 



CHAPTER V 



Adjustment to Conditions of Aquatic Life 



I. Individual adjustment: p. 242. i. Life in the open water, p. 243. 

 Flotation, p. 243. Swimming, p. 249. 



2. Life on the bottom, p. 251. Adjustment to shore life, p. 251. Avoid- 

 ance of silt, p. 252. Burrowing, p. 254. Shelter building, p. 257. With- 

 standing current, p. 258. 



3. Adjustment of the hfe cycle, p. 261. Encystment, p. 262. Winter 

 eggs, p. 265. Readaptations to aquatic life, p. 269. Plants, p. 269. 

 Animals, p. 273. 



//. Mutual adjustment: p. 282. Insectivorous plants, p. 283. The lar\^al 

 habits of fresh-water mussels, p. 287. 



CHAPTER VI 



Aquatic Societies 



I. Limnetic societies: p. 293. i. Plancton, p. 295. Seasonal range, p. 302. 

 Plancton pulses, p. 305. Distribution in depth, p. 307. 

 2. Necton, p. 313. 



//. Littoral societies: p. 314. i. Lenitic societies, p. 315. Plants, p. 318. 

 Animals, p. 324. Spatial relations of lenitic animals, p. 326. Life in 

 some typical lenitic situations, p. 333. Pond societies, p. 334. Alarsh 

 societies, p. 341. Bog societies, p. 348. Stream, beds, p. 356. 

 2. Lotic societies, p. 363. Plancton gatherers, p. 364. Ordinary- foragers, 

 p. 368. 



CHAPTER VII 

 Inland Water Culture 

 I. Aboriginal water culture, p. 377. 



//. Water crops: p. 379. Plants, p. 379. Animal products, p. 382. Fish 

 culture, p. 384. The forage problem, p. 387. Staple foods, p. 389. The 

 way of economic progress, p. 399. 



