Skeleton, of bird, 152; cat, 188; frog, 131; of fish, 113; chart of, 218. Skull, mammalian, 194. Slipper animalcule, 13. Sloth, 199. Slug, 105. Snail, 105. Soil, 48. Sparrow, 182; English, 170. Specialization, 20, 27, 66, 210. Species, 8. Spermary, 25, 27. Spicule, 18. Spider, 94. Spiracle, 77, 87. Sponges, 17, 125; glass, 19; horny, 19; limy, 19. Sports, 148, 224. Squash bug, 93, 95. Squid, 106. Stickleback, 119. Struggle to live, 147. Study, comparative, 82, 149, 223. Sun energy, 2. Sunlight, 2. Survival of fittest, 147. Tadpole, 126, 134. Tapeworm, 49. Tarantula, 94. Teeth, of frog, 130. Terrapin, 143, 144. Toad, 137. Tortoise, 140, 143, 144. Trap-door spider, 94. Tube feet, 35. Tumble bug, 90, 91. Turtle, 140, 143, 144. Umbo, 98. Ungulate, 212. Vacuole, 11, 12, 14. Vampire, 203. Variation, 147. Variety, 8. Venomous snakes, 143. Vent, 42. Ventral, 43. Vermes, 9, 125. Vertebrates, 9, 125. Vertebrate skeletons, 218. Viscera, of bird, 163. Warning sound, 147. Wasps, digging, 89. Weevil, 90, 91, 96. Whale, 208. Wings, of grasshopper, 67; of bird, 153, 158. Woodpecker, 180. Worms, 42. Zoology defined, 1. Zoophytes, 33. ------------------------------------------------------------------------ TRANSCRIBER’S NOTES Page Changed from Changed to 61 Have you seen crayfish with one Have you seen crayfish with one claw smaller than the claw smaller than the other? 1. Typos fixed; non-standard spelling and dialect retained. 2. Enclosed italics font in _underscores_. 3. Enclosed bold font in =equals=. 4. The caret (^) serves as a superscript indicator, applicable to individual characters (like 2^d) and even entire phrases (like 1^{st}). 5. Subscripts are shown using an underscore (_) with curly braces { }, as in H_{2}O.