438 



INDEX 



Schwann, 25, 92, 196 

 Scolex, 326 

 Seat-worm, 324 

 Segmentation cavity, 209 



of ovum, 199 

 Senescence, 413 

 Setse, locomotor, 126 

 Sexual organs, atrophic changes 



in, 419 



Shattuck and Ballance on car- 

 cinoma, 407 

 Sheep tick, 313 

 Sheep-scab, 321 

 Side-chain theory of Ehrlich, 



351 



Sight, development of, 160 

 Size of organisms, relation to 



complexity, 111 

 Sitotropism, 48 

 Situs in versus viscerum, 221 

 Shin, atrophic changes in, 419 

 Skin-grafting, 397, 399 

 Small-pox and vaccination, 361 

 Smell, development of, 164 

 Smut of corn, 305 

 Somatic cells, 188 



differentiation of, from 

 germinal cells, 117 



death, 422 

 Spallanzani, 25, 377 

 Special sense, organs of, 157 

 Specialization of cells, 108 

 Species, 281 



Spencer, Herbert, and evolution, 

 261 



on heredity, 224 

 Spermatocyte, 190 

 Spermatogenesis, 189 

 Spermatozoa, 189 

 Spermatozoon, locomotion of, 



80 

 Spillman on Mendel's law, 245 



Spina bifida, development of, 



221 



Spirem, 102 

 Spirillosis, 320 

 Spirochseta duttoni, 320 

 Spirochsetes, 332 

 Spirogyra, 113 



conjugation in, 177, 178 

 Spleen, regeneration of, 386 

 Sponges, reproduction in, 183 



structure of, 118 

 Spongioplasm, 94 

 Spontaneous generation, 21 

 Sporosacs, 182 

 Sporozoa, parasitism of, 308 

 Sporulation in coccidium, 168 

 St. Augustine, 256 

 Starch, formation of, 89 

 Stentor, nucleus of, 98 



regeneration in, 373 

 Stigma, 185 

 Stimulation, chemical, 46 



electric, 60 



food, 48 



gravity, 63 



light, 54 



mechanical, 43 



oxygen, 52 



photic, 54 



thermal, 37 



water, 50 



Stimuli, action of, 34 

 Stirp, 229 

 Stomoxys, 314, 331 

 Strasburger, 176 



on grafting, 411 

 Strobila, 326 



Structural relationship, 273 

 Sundew, 43. See Drosera. 

 Sun's rays, effect of, 54 

 Surra, 314 

 Suspensorium, 179 



