474 



INDEX 



Stoma, 28, 88 



Stomach, 137, 148-158, 155 



Storage root, 67 



Struggle for existence, 330, 375, 



411 



Style, 108 



Subclavian artery, 171; vein, 164 

 Subgenus, 351 

 Suboesophageal ganglion, 122, 123, 



130, 131 

 Suborder, 351 

 Subspecies, 351 

 Sugar, 13, 36, 158 

 Sulfates, 36 

 Sulfur Bacteria, 309 

 Sundew, 73 



Survival of the fittest, 375, 406 

 Swammerdam, 388 

 Sweat gland, 139, 176 

 Swimming foot, 131, 132 

 Sylvius, 395 

 Symbiosis, 331-334; Alga and 



Fungus, 332 

 Symmetry, bilateral, 124; radial, 



118 

 Sympathetic nervous system, 186 ; 



~192 



Synapse, 185 

 Synapsis, 281, 234, 235, 287, 289, 



290, 296 



Synaptic mates, 232 

 Syngamy, 244 (see Fertilization) 

 Synkaryon, 241, 244, 250 

 Systems, of organs, 116 



Tactile corpuscle, 195 

 Talpa, 317 

 Tamias, 349 

 Tap root, 65 

 Tapeworm, 135, 414 

 Tapirs, distribution of, 368 

 Tarsus, 144, 145 



Taste, sense of, 195 

 Taxonomy, 4, 348-351, 390-392 

 Teeth, 138; evolution, in Camel, 



363; evolution, in Horse, 362 

 Telophase, 225 

 Temperature, body, 174; limits 



for life, 311, 312; regulation, 



174, 312; sense, 195 

 Tendril, 70, 72 

 Tennyson, 203 

 Tentacles of Hydra, 119 

 Testis, 119, 123, 131, 149-152, 203 

 Tetanus, 311 

 Thallophytes, 112, 413 

 Thallus, 62, 63, 112, 113 

 Theophrastus, 2, 381 

 Thistle, 72 

 Thomson, J. A., 6, 154, 297, 307, 



364 



Thoracic duct, 168 

 Thorax, 130, 140, 153 

 Thrush, 369 



Thymus gland, 150, 152, 155, 159 

 Thyroid gland, 152, 155, 159, 182 

 Tibia, 144, 145, 354 

 Time, geologic, 358; cosmic, 358 

 Tissue, 59; connective, 59, 142; 



systems, 60, 116 

 Tonsils, 155 

 Totipotent, 258 

 Toxin, 338 



Trachea, 149, 153, 155 

 Tracheid, 86 

 Transpiration, 87, 88 

 Transverse process, 137, 143 

 Treviranus, 3, 410 

 Trichocyst, 40 

 Tricuspid valve, 165, 172 

 Trihybrid, 280, 281 

 Trillium, 70 



Trypanosome, 337, 338, 414 

 Tunicate, 146, 415 

 Turgor, 84 



