248 



INDEX 



Regional differentiation of the earth- 

 worm, 130 



Rejuvenescence by conjugation, 70 



Rennin, in yeast, 37 



Repi eduction in amoeba, 52; in 

 bacteria, 39; in earthworm, 154; 

 in fern, 119; in hydra, 92; in 

 paramecium, 63; in pleurococcus, 

 1 06; property of protoplasm, 13 



Reproductive cells of hydra, 86 



Reproductive system of the earth- 

 worm, 151; of the lobster, 177 



Reserves of nutriment, 19 



Reticular theory of protoplasm 

 structure, 17 



Retzius, 150 



Reymond, du Bois, protoplasm de- 

 fined, 6 



Rhizome of the fern, up 



Roux, significance of mitosis, 206 



S 



Sachs, 124 



Saprophytic nutrition, 54 

 Saprozoic nutrition, 54 

 Sarcode, original name given to pro- 

 toplasm, 27 

 Sars, 199 



Scaphognathite of lobster, 171 

 Schleicher, karyokinesis, 205 

 Schleiden and Schwann, cell theory, 



26 



Schneider, K.- C., 83, 85, 139 

 Schultze, M., identity of sarcode and 



protoplasm, 27 

 Schwann, and Schleiden, 26 

 Scolex of the tape- worm, 187 

 Secretin, action in digestion, 41 

 Sedgwick and Wilson, 18, 19, 21, 

 24, 30, 31, 32, 39, 44, 47, 104, 

 109, no, in, 112, 113, 114, 115, 

 123, 124, 131, 133, 135, 143, 144, 

 147, 149, 155, 156 



Segmentation cavity in cleavage, 77 

 Segregation of characteristics, 217 

 Senescence in protozoa, 67 

 Sense organs of the lobster, 1 75 

 Sensory cells of hydra, 85, 87 

 Sensory system of the earthworm, 



1.45 



Serial homology, 164 



Setae of the earthworm, 131, 132 



Sex determination, experimental evi- 

 dence, 226; in man, 224 



Sex-determining chromosomes, 225 



Sex-linked inheritance, 227 



Sexual generation, of fern, 121; of 

 hydroid, 96 



Side-chain hypothesis, 196 

 Slime cells of hydra, 87 

 Somatic and germ plasm, 203 

 Somatoblasts in development, 155 

 Somites of the earthworm, 130 

 Sori in ferns, 1-21 

 Source of animal energy, 101 

 Spencer, germ plasm, 203 

 Sphaerella lacustris, 103 

 Sphaeroidal colonies, 75 

 Spongy mesophyll, 115 

 Spontaneous generation, 66 

 Sporangium formation in the fern, 



121 



Sporulation, method of reproduc- 

 tion, 13 



Starch formation in plants, 116 

 Stereome in the fern, 112 

 Stigma, "eye" in euglena, etc., 57 

 Stomach-intestine, function, 137; 



structure, 135 

 Stomata of the fern, 115 

 Stomodaeum, 157 

 Suminski, 123 



Summary of coelenterata, 99 

 Supporting lamella of hydra, 88 

 Sweet wort culture medium, 32 

 Symbiosis in Hydra viridis, 94 

 Synapsis stage in maturation, 209 

 Synura uvella, colony of protozoa, 

 55,58 



Tactile organs of the lobster, 176 

 Taenia solium, the tape- worm, 186 

 Tape- worm, 186 

 Taxonomy, subject matter, 3 

 Tetrads in maturation, 209 

 Tissues definition, 28 

 Tower, genetics, 228 

 Tracheae of insects, 185 

 Tradescantia, circulation of proto- 

 plasm, 21 



Trichina spiralis, 188 

 Trichinosis, 189 

 Trichocysts of paramecium, 61 

 Trypsin, digestive ferment, 36 

 Tschermak, genetics, 214 

 Typhlosole, 138 



U 



Urea, food for bacteria, 40; disposal 

 in amoeba, 49; product of me- 

 tabolism, ii 



Uroglena Americana, colony of pro- 

 tozoa, 56 



Use and disuse of organs, 229 



