INDEX 



361 



Sea-urchins, 134, *i35, *i37, *i38. 



Seals, 268; fur, parasitized, *300. 



Seal harbor, 268. 



Selection by nature, 275, 



Senses, the special, 103. 



Setting board for butterflies, *338 ; 

 for butterflies, how to make, 

 336. 



Shark, muscles of, *75. 



Sheep, Rocky Mountain, *257, 

 266. 



Shell-fish, 139. 



Shells of Protozoa, 120: sea, 143. 



Shrews,^26i. 



Sight, sense of, 109. 



Silkworm, *I2; cocoon of, 15; 

 dissection of, *i4; eggs of, 9, 

 11; feeding of, *I2; hatching 

 of, 11; moths of, 16, 17; pupa 

 of, 15. 



Silkworms, how to rear, 9; life- 

 history of, 9; moulting of, 13. 



Silkworm moth, egg-laying of, 17; 

 larvse of, 11; life-history of, 9. 



Sirenia, 256. 



Skate, 214; barn-door, 214; 

 common, *2is. 



Skeleton, 68; of cat, *7i; of cat 

 described, 73 ; of invertebrates, 

 69; of vertebrates, 71. 



Skinning mammals, 341 



Skink, blue-tailed, *223. 



Skunk, 269; 



Slave-making by ants, 314. 



Slipper animalcule, 116. 



Slug, giant yellow, *i4i 



Slugs, sea, *i4i. 



Smell, sense of, 105. 



Snake, brain of, *I03; eggs of, 



44- 



Snakes, 224. 



Snowflake, *25i. 



Social life among animals, 302. 



Sound-making of cricket, 182; 

 organ of Cicada, *i8o; organ 

 of cricket, *i82. 



Spade-foot, 217. 



Sparrow, brain of, *I03; EiigUsh, 

 *59. 230, 273; English, external 

 structure of, 58; Western chip- 

 ping, *233. 



Spat, oyster, 140. 



Special senses, 103. 



Sperm-whale, 262. 



Spreading adder, 226. 



Spreading board for butterflies, 

 *337, *338- 



Spider and web, *20o; ballooning, 

 ready to sail, *2o6 ; catching a, 

 *i9i; dropping from pencil, 

 *i9i; eyes and jaws of, *192; 

 how orb - web is constructed, 

 *203; jumping, * 195; labyrinth, 

 egg-cocoon of, *38, *2o8; long- 

 legged, *204; make-up of body 

 of, 192; orb weaving, *i99; 

 putting in foundation Unes for 

 orb-web, *202; running, with 

 egg -sac, *39, *I94; cobweb- 

 weaving, 197 ; funnel web- 

 weaving, *i98; jumping, 195; 

 spinnerets of, *i93; spinning 

 organs of, 193; trap-door, bur- 

 row of, *4i, *I97; trap-door, 

 with burrows, *40, *I96; tri- 

 angle, and web, *205; turret, 

 nest of, *42 ; web-weaving, *194. 



Spiders, collecting, 190; homes of, 

 36; Ufe-history of, 207 ; running, 

 194; web-weaving, 196; young, 

 assembly of, *207 ; young, webs 



of, *207. 



Spider crab, 155. 



Spiracles, defined, 13. 



Spiracles of insects, 82. 



Spizella socialis arizono), *233. 



Sponge, simple, * 1 25; glass, * 126. 



Sponges, 125. 



Spreading board for butterflies, 



how to make, 336. 

 Squid, giant, *I43. 

 Squirrel black, 261; flying, 261; 



fox, 261; gray, 261; red, 261. 

 Starfishes, 134, *I35, *I36. 

 Stentor, *I20. 

 Stickleback, nest of, 44. 

 Sting-ray, 214. 

 Strongylocentrotus franciscanus, 



*i35, *i37, *i38. 

 Structure, external, of English 

 sparrow, 58; external, of 

 grasshopper, 48; external, of 

 locust, *50; external, of pond 

 snail, 52; external, of sunfish, 



54- 



Struggle for life, 274. 



Students, drawings by, 325;" note- 

 books of, 325. 



Stylops, parasitic habits of, 298. ' 



Suckers, 211. 



