472 



INDEX 



Respiration, 37, 87, 89, 396; in 



animals, 43, 161-174; chemical 



equation, 37; in Invertebrates, 



169; in Vertebrates, 169 

 Respiratory, currents, paths of, 



170; membranes, 175; system, 



116 

 Response, 18; organic, 307 (see 



Adaptation) 

 Retina, 200, 201 

 Reversion, 269 

 Rhinencephala, 188 (see Olfactory 



lobes) 



Rhizoids, 104 

 Rhizome, 70, 74, 103 

 Rib, 137, 141 

 Ricinus, 81 

 Rockweed, 62, 63 

 Rodentia, 349 

 Rods and cones, 201 

 Roman science, 382 

 Root, 65-69, 76, 78-80, 112; cap, 



79; hair, 80; primary, 65; tip, 



79, 87 



Rostrum, 131 

 Rotifer, 135; parthenogenesis in, 



249 

 Round Worms, parthenogenesis 



in, 249, 415 

 Runners, 70; of Strawberry, 69 



Sacculus, 196, 197 



Salivary glands, 155, 157, 159 



Sap cavity, 77 



Saprophytic, 51 



Sarcode, 7 



Sargassum, 64 



de Saussure, 393 



Scales, 72 



Scapula, 141, 144 



Sceloporus, 150 



Schizogony, 335 



Schleiden, 399 



Schuchert, C., 358 



Schultze, 7, 400 



Schwann, 242, 399, 400 



Scientific method, 2 



Sciurus, 152, 349 



Sclerotic coat, 201 



Sea Lettuce, 63 



Sea Urchin, 135, 259, 415; devel- 

 opment, 58; egg, 256 



Seaweeds, 62, 63 



Sebaceous gland, 139 



Secondary root, 66 



Secretion, 158 



Seed, 66, 110, 111, 112; coat, 111; 

 plants, 61 



Segregation, 274, 280-283, 286, 

 290, 306 



Selaginella, 107 



Selection, 299-306, 377; artificial, 

 373; natural, 306, 324, 374, 376, 

 378, 410, 411; in population, 

 300; in pure lines, 300 



Semicircular canals, 196-^05 



Seminal fluid, 152, 207 



Seminal vesicle, 123, 151 



Senile degeneration, 244 



Sense, auditory, 196; cutaneous, 

 195; cells, differentiation of, 



. 194; organs, 116, 193-202; 

 pain, 195; sight, 198; smell, 

 196; taste, 195; temperature, 

 195 



Sensitive Fern, 74 



Sensory nerve, 191 



Sepal, 107, 112 



Septa, 121 



Setae, 124 



Sex, 34, 113; chromosome, 292- 

 295, 377; determination, 291- 

 293; differentiation, 96-98; 

 linked characters, 268, 291, 293; 

 origin, 94, 95 



