Index. 



RAP 



185 ; root of, 184 ; flower of, 



188 



Raphides, 157 

 Ray, 348 

 Rectum, 279 

 Reflex action, 317 

 Regne Animal, 349 

 Rejuvenescence, 74 

 Renal-portal circulation, 291 

 Reproduction, 35, 52 

 Reproductive organs in Rana, 



development of, 327 

 Resin canals, 183 

 Respiration, 35 ; in the plant, 208 ; 



in the animal, 241 

 Retina, 325 

 Rhizoids, 103 

 Root cap, 120 ; hairs, 121 

 Rotation of crops, 195 ; of the 



earth, 19 



CACCHAROMYCETES, 72 



J Sachs, von , 352 



Saliva, 337 



Salts associated with protoplasm, 



28 ; absorption of, by the plant, 200 

 Saprophytic Fungi, 100 

 Sarracenia, 214 ; structure of the 



leaf of, 216 



S:alariform vessels, 119 

 Scapula, 305 

 Scent of flowers, 169 

 Schizomycetes, 72 

 Schleiden, 349 

 Schultze, Max, 351 

 Schwann, 350 

 Sc'ence, methods of, 2 

 Sciences, 2 ; classification of the, 2 

 Sclerenchyma, 102 

 Sclerotic, 322 

 Secretions, 35 

 Secretory nerves, 317 

 Seed, structure of the, 174 

 Segmentation, 61 ; cavity, 231 

 Sdaginella, leaf of, 134 ; root of, 



135; sporangium of, 135, 141 ; 



cone of, 136 ; spores of , 137, 139 ; 



stem of, 134 ; sporophyte of, 132; 



alternation of generations in, 142; 



embryo of, 141 ; life-history of, 131 

 Self-fertilisation, 168 

 Sensitivity of plants, 213 

 Sensory nerves, 317 : . , 



/^r'V^^" 



TAR 



Sexual differentiation, origin of, GO; 

 reproduction, 52 



Sieve tubes, 119, 150 



Sight, sensation of, 325 ; organ of, 

 322 



Sinus venosus, 285 



Skeleton, 297 



Skin, 268 



Smell, organ of, 320 



Soil, composition of the, 196 



Solar radiation, 19 



Solubility of gases, 42 



Somatopleure, 249 



Somite, 235 



Sorus, 123 



Spectrum analysis, 4, 10 



Sperm arium, 85 



Spermathecae, 247 



Sperms, development of, 247 



Sphenethmoid, 302 



Spinal cord, 252, 310, 313, 317 ; 

 nerves, 310 



Spiral vessels, 119 



Spi'Ogyra, life-history of, 76 



Splanchnopleure, 249 



Sporangium, 109 122, 162, 188 



Spores, 95, no, 124 



Sporophylla, 123, 136, 158, 188 



Sporophyte, 132 



Sprengel, 352 



Squamosal, 304 



Stamen, structure of, 162 ; develop- 

 ment of, 164 



Starch, 155 



Stem, increase in thickness of, 180 



Sternum, 304 



Stolon, 103 



Stomata, 122, 153 



Stomodaeum, 262 



Sulphur, origin of and importance 

 to the plant of, 192 



Supra-s' apula, 305 



Suspensor, 173 



Sympathetic nervous system, 311 



Symphysis, 306 



Synergidae, 170 



Synthesis, 22 



Systema Naturte, 348 



Systemic circulation, 288 



Systole, 73 



TADPOLE, 332 

 Tapetal tissue, 126, 165, 167 

 T^sus, 3o6 



