INDEX 



583 



Spheroid colonies, 195, 196. 



Spiders, see Arachnida. 



Spinal cord, 66, 108; cross section of, 



109; functions of, 116; white and 



gray matter of, 116, 118. 

 Spinal nerves, 66, 108; see also 



Nerves. 

 Spindle fibers, 137. 

 Spiracles of locust, 348, 355. 

 Spireme, 137. 

 Spirigera, 189. 

 Spirostomum, 176, 190. 

 Spleen, 48. 

 Spondylomorum, 196, 

 Sponges, see Porifera. 

 Spontaneous generation, see Abio- 



genesis. 

 Sporozoa, 155, 190, 241. 

 Sporulation, 219. 

 Springtail, 372. 

 Squamous epithelium, 140. 

 Squash-bug, 379. 

 St. Hilaire, 544. 

 Starfish, see Echinodermata. 

 Statistical method, see Biometry. 

 Steapsin, 85. 

 Stegocephala, 12, 13. 

 Stegomyia, 386. 

 Stentor, 176, 190. 

 Stereotropism, 182, 264, 304. 

 Stimulus, 76; reception of, 124. 

 Stinging capsule, see Nematocyst. 

 Stomach, 47; absorption in, 88; 



digestion in, 82. 

 Stomach-intestine, 292. 

 Stomodaeum, 413. 

 Stone-fly, 373, 378. 

 Striated muscle, 146, 147. 

 Stridulating organ, 364, 365. 

 Stropheodonta, 514. 

 Struggle for existence; see Natural 



Selection. 

 Siylonichia, 176, 190. 

 Sub-esophageal ganglion, 359. 

 Submucosa, 417. 

 Suckers, of frog, 413. 

 Sucrase, 85. 

 Suctoria, 175, 190. 



Supporting lamella, 249. 



Survival of the fittest, see Natural 



Selection. 

 Sus scrofa, 524. 

 Sustentative tissue, 140, 142, 144; 



adipose tissue, 143, 145; bone, 143; 



cartilage, 143; connective tissue, 



143; vascular tissue, 143, 145, 



146. 

 Sutton, 474. 

 Swimmerets, 323, 326. 

 Symbiosis, 259. 

 Symmetry, forms of, 243. 

 Sympathetic nerves, 67; see also 



Nerves. 

 Sympathetic system, of locust, 359. 

 Synapse, 108. 

 Synapsis, 227, 229. 

 Syngamy, 174, 214, 220. 

 Synthetic type, 518. 

 Synura, 196. 



Tadpole, 411, 412, 413, 414; gills of, 



46, 414. 

 Tannreuther, 173. 

 Tarpan, 527. 



Taste, in earthworm, 302; in locust, 

 360. 



Taxis, see Tropism. 



Taxonomy, 3, 5, 6. 



Telegony, 454. 



Telencephalon, 116, 119; see also 

 Cerebrum and Olfactory lobes. 



Teleostomi, 10, 37, 63. 



Telson, 323, 334. 



Temperature, influence on develop- 

 ment, 442, 443. 



Tentacles, 190, 249, 312. 



Tentaculata, 238. 



Tentaculifera, 190. 



Testis, of earthworm, 297; of frog, 



47, 52, 54, 402; of Hydra, 270; of 

 locust, 358. 



Telophase, 139. 



Termite, 373. 



Tethelin, 101. 



Theory of Organic Evolution, 489. 



Thermotropism, 264, 304. 



