Index 889 



Schizont, 365,* 366 

 Schleiden, 31, 37, 803 

 Schultze, 38 

 Schwann, 31, 37, 803 

 Scientific method, 17, 20-24, 804, 805 

 Sclera, 497,* 505 



Sclerenchyma, 141,* 197* {see also 

 Tissues, plant) 



Scleroblast, 283* 



Scolex, 293, 377, 377,* 379, 538* 

 Scorpion fly, 319, 326* 

 Scouring rush, 110, 137, 137,* 256 

 (see also Horsetail) 



Scrotum, 514* 

 Scurvy, 475 



Scypha (Grantia), 279-281, 281,* 284* 

 {see also Sponge) 



Scyphistoma, 290* 

 Scyphozoa, 289, 290* 

 Sea anemone, 290, 291* 



cucumber, 304, 306* 



fan, 290 



lily, 304 



pen, 290 



squirt, 328* 



urchin, 303, 303,* 304* 



walnut, 293 



weed {see Algae) 



Sebaceous gland {see Glands; Skin) 

 Secondary sexual traits {see Heredity) 

 Secretin {see Endocrine glands) 

 Sedentary, 856 



Seed, 138, 140,* 142, 143, 144,* 146,* 

 200-218, 225* 

 coat, 210, 213 

 leaf, 194 

 Segmentation, 304, 307,* 309, 314, 325 

 Segregation law, 685 

 Selaginella, 135, 136,* 193 

 Semen, 514 



Seminal receptacle, 311,* 312,* 371,* 

 372, 373, 385,* 389,* 391, 

 398 

 vesicle, 296,* 371,* 372, 380,* 382, 

 385,* 389,* 391, 406, 513, 

 514* 



Sensitive plant, 106 

 Sensitivity of protoplasm, 357 

 Sensory equipment, 494-506 {see also 

 specific organisms) 



Sepal, 144,* 208, 212, 223*-225* 

 Septa, 173, 179, 308, 384, 385,* 386, 

 387* 



Serpent star, 303 

 Sertoli cell, 709 

 Serum, 478 

 Sesamoid bone, 466 

 Sessile, 106, 116 



Seta, 132,* 134,* 189, 304-308, 307,* 



380,* 384, 387* 

 Sewage, 781-783 

 Sex cell, 162 {see also Reproduction) 



chromosome, 675,* 694,* 697,* 698 



determination, 697,* 698 



-influenced traits, 703 



-Hnked traits, 699-703, 700*-703* 



ratio, 698 

 Sexual dimorphism, 857 

 Sharks, 329,* 331, 573 

 Shelf fungus, 128,* 129, 179, 671 

 Shell, 79,* 81, 81,* 83,* 309, 310, 311, 

 313,* 316,* 377, 377,* 406 



Shellac, 559* 



Shipworm, 311, 314,* 542 

 Shrimp, 318, 322, 324,* 543 

 Sieve membrane, 282* 



tube, 145,* 147,* 192, 220, 224 

 Sigmoid, 471,* 477 

 Silicon, 159, 160, 194, 280, 281 

 Silk, 146,* 567* 

 Silkworm, 565, 567,* 786 

 Silverfish, 550, 551,* {see also Insects) 

 Sinus, 314, 322,* 395, 479,* 480 



venosus, 332,* 431, 431,* 741* 

 Siphon, 164, 312,* 313,* 315,* 328* 

 Siphonoglyphe, 291* 

 Skate, 331 



Skeleton, 329-343, 423-425, 423,* 465- 

 467, 462* {see also specific 

 organisms) 



Skin, 421,- 422,* 437, 459-465, 460,* 



493, 504, 518 

 Skipper {see Insects) 

 Skull, 587* 



Sleeping sickness, 660, 784 

 Slime mold (Myxomycophyta), 109, 



122-124, 123,* 172, 173, 252 

 Slug (snail), 310, 542 

 Smut, 129, 179, 180* 

 Snail, 310, 310,* 311,* 312,* 542 



variations in, 723* 

 Snake, 337,* 340 

 Snow flea, 411,* 550 

 Society, human, 585-590 

 Soils, 794 

 Sol, 76 

 Solation, 857 



Somatic modifications, 722 

 Somatoplasm, 708-712, 708* 

 Somite, 304, 307,* 385* 

 Sorus, 137, 139,* 182,* 192, 196, 196,* 



198 



Sound production and reception, 393, 



435, 761, 762 

 Sowbug, 317,* 318, 544 

 Spallanzani, 733 

 "Spanish moss," 669, 670* 



