254 



INDEX 



Reproductive cells of Hydra, 88 



Reproductive system of the earth- 

 worm, 155; of the lobster, 181 



Reserves of nutriment, 19 



Reticular theory of protoplasm 

 structure, 17 



Retzius, 154 



Reymond, du Bois, protoplasm de- 

 fined, 6 



Rhizome of the fern, 112 



Roux, significance of mitosis, 21 1 



Sachs, 127 



Saprophytic nutrition, 55 

 Saprozoic nutrition, 55 

 Sarcode, original name given to pro- 

 toplasm, 27 

 Sars, 204 



Scaphognathlte of lobster, 175 

 Schizogony, 15 

 Schleicher, karyokinesis, 209 

 Schleiden and Schwann, cell theory, 



26 



Schneider, K. C., 85, 87, 142 

 Schultze, M., identity of sarcode and 



protoplasm, 27 

 Schwann, and Schleiden, 26 

 Scolex of the tape- worm, 191 

 Secretin, action in digestion, 41 

 Sedgwick and Wilson, 18, 19, 21, 

 24* 30, 31, 32, 36, 45, 48, 107, 

 no, 112, 113, 114, 115, 116, 123, 

 124, 127, 134, 136, 147, 148, 151, 

 152, 159, 160 



Segmentation cavity in cleavage, 79 

 Segregation of characteristics, 222 

 Senescence in protozoa, 68 

 Sense organs of the lobster, 179 

 Sensory cells of Hydra, 87, 89 

 Sensory system of the earthworm, 



149 



Serial homology, 167 

 Setae of the earthworm, 134 

 Sex determination, experimental evi- 

 dence, 230; in man, 226, 228 

 Sex-determining chromosomes, 226- 



230 



Sex-linked inheritance, 232 

 Sexual generation, of fern, 124; of 



hydroid, 98 



Side-chain hypothesis, 200 

 Slime cells of Hydra, 89 

 Somatic and germ plasm, 208 

 Somatoblasts in development, 159 

 Somites of the earthworm, 133 

 Sori in ferns, 124 

 Source of animal energy, 103 

 Spencer, germ plasm, 208 

 Sphaerella lacustris, 108, 109 

 Sphaeroidal colonies, 77 



Spongy mesophyll, 1 1 7 

 Spontaneous generation, 67 

 Sporangium formation in the fern, 



124 



Sporophyte, 122 



Sporulation, method of reproduc- 

 tion, 13 



Starch formation in plants, 118-121 

 Steapsin, 40 



Stereome in the fern, 114 

 Stigma, "eye" in Euglena, etc., 58 

 Stomach-intestine, function, 140; 



structure, 138 

 Stomata of the fern, 117 

 Stomodaeum, 161 

 Suminski, 124 4 

 Summary of coelenterata, 100 

 Supporting lamella of Hydra, 90 

 Sweet wort culture medium, 32 

 Symbiosis in Hydra viridis, 96 

 Synapsis stage in maturation, 214 

 Synura uvella, colony of protozoa, 

 57, 58 



Tactile organs of the lobster, 180 

 Taenia solium, the tape- worm, 190 

 Tape-worm, 190 

 Taxonomy, subject matter, 3 

 Tetrads in maturation, 214 

 Tissues, definition, 28 

 Tower, genetics, 233 

 Tracheae of insects, 189 

 Tradescantia, circulation of proto- 

 plasm, 21 



Trichina spiralis, 192 

 Trichinosis, 193 

 Trichocysts of Paramecium, 62 

 Trypsin, digestive ferment, 40 

 Tschermak, genetics, 219 

 Typhlosole, 141 



U 



Urea, food for bacteria, 37; disposal 

 in Amoeba, 50; product of me- 

 tabolism, II 



Uroglena Americana, colony of pro- 

 tozoa, 58 



Use and disuse of organs, 234 



V 



Ventral and dorsal differentiation, 

 18 



Verworn, definition of irritability, 

 52; experiments with Amoeba, 49 



Vestigial organs, 234 



Vitamines, 42 



Voluntary and involuntary move- 

 ments, 24 



