INDEX 



531 



Sacculus, 212, 213 



Salamander, 117, 118, 235 



Salientia, 111-119 



Saliva, 151, 156 



Salivary gland, 151, 152 



Sandworm, 81, 82, 247, 477 



San Jose scale, 410, 411 



Saprophyte, 43, 44 



Sarcocystis, 396 



Sarcodina, 47-49; See: Amoeba 



de Saussure, 463 



Scale-insect, 410-4/4 



Scale of nature, 426 



Scales, 134, 138 



Scallop, 86, 87 



Scapula, 142, 144 



Schaudinn, 394 



Schistosoma, 396 



Schizogony, 340 



Schleiden, 464, 465 



Schultze, 465 



Schwann, 254, 464-466 



Sciatic plexus, 205 



Science, scope, 1, 24, 385, 386, 



388 

 Scientific method, 2, 228, 464 

 Sciurus, 148, 353 

 Sclerotic coat, 216 

 Scolex, 398-400 

 Scorpion, 95 

 Scorpion-fly, 94 

 Scrotum, 148 

 Scurvy, 23, 159 

 Scyphistoma, 75 

 Scyphozoa, 73-75 

 Sea anemone, 75, 76 

 Sea cucumber, 85, 86 

 Seahorse, 115 



Seal, 129, 321, 323, 367, 419 

 Sea lily, 85, 86 

 Sea pen, 77 



Sea urchin, 85, 86, 277, 279, 478 

 Sea walnut, 78 

 Sebaceous gland, 134, 181 

 Secondary sexual characters, 192, 



262; See: Sex 

 Secretin, 160 



Secretion, 61, 63, 134, 159, 180 

 Seed plants, 221, 359, 361, 372, 417, 



457 

 Segment, 81, 103, 107, 108 

 Segmentation, 81, 82, 90, 96, 97, 101- 



108, 112, 185, 206 



Segmented worm, 81, 82, 97; See: 

 Earthworm 



Segregation, 244, 246, 290-297, 300, 

 302, 315, 510 



Selection, 282, 376-384, 473, 475, 476; 

 See: Natural selection 



Self-digestion, 156 



Semicircular canal, 212, 213 



Seminal receptacle, 103; vesicle, 103, 

 194 



Seminiferous tubule, 194 



Senile degeneration, 256-259 



Sense organ, 65, 74, 143, 199, 201, 207, 

 209-217, 344 



Sensory nerve, 201, 206, 207 



Septum, 101, 102 



Serial homology, 356, 357; See: Ho- 

 mology 



Setae, 81, 102, 103 



Sex, 188, 189, 192, 254, 255, 261, 262, 

 284, 306-310; determination, 304- 

 307; differentiation, 306; linked, 

 307, 308; reversal, 306; See: Fer- 

 tilization and Reproduction 



Shakespeare, 449 



Shark, 113, 114, 171, 365 



Sheep, 130, 283, 396-398 



Shell, 86-88 



Shell-fish, 86 



Shell-heaps, 441 



Ship worm, 88 



Shorthorn cattle, 298 



Shoulder blade, 144 



Silkworm, 414, 416, 454 



Silver-fish, 92, 94 



Simiidae, 427-429 



Simple eye, 330 



Simplex group, 245, 248, 249, 261, 306 



Sinanthropus, 433 



Sinus venosus, 170, 171, 173 



Siphon, 88, 89 



Sirenia, 129, 130 



Skate, 114 



Skeleton, 63, 77, 138-/44, 322, 323, 

 355-357, 435 



Skin, 7, 134, 135, 161, 180, 181, 201, 

 319 



Skull, 112, 141-149, 432-437 



Sleeping sickness, 341, 391, 407 



Sloth, 129, 321-323 



Slug, 87 



Small intestine, f 52-154 



Smallpox, 343 



