722 - Index 



storage parenchyma, 243, 215, 246; strengthen- 

 ing, 243-4 1: vascular, 242, 244 



Tjio, J. II., 507 



Tobacco mosaic virus, 8, 9 



Tongue. 297, 298, 300, 302 



Tongue worms, 665 



Tooth-shells, 652, 653 



Torpedo occidentalism 441 



TPN (see Triphosphopyridine nucleotide) 



Trace elements, 137. 142-43, 346 



Trachea. 297, 303. 359. 360 



Tracheitis, 617 



Tracheophyta (vascular plants), 611-21; Lycop- 

 sida, 612-14; Psilopsida, 611-12; Pleropsida, 

 615-21: Sjdieuojisida. 614-15 



Traction fibers, 44, 46 



Transduction. 427 



Transfer RNA. 525 



Transformation, bacterial. 520, 521 



Transfusion, blood types in relation to. 325-26 



Transmission, electron-hydrogen, 116—49; mech- 

 anisms of, basic, 427-29 



Transphosphorylases, 101 



Transpiration, 250-51, 252: flow of sap and. 251- 

 52 



Transport mechanisms (sec Active transport 

 mechanisms: Passive transport mechanisms) 



Trematoda, 637-39 



Triassic period, 563, 565 



Tricerato-ps. 568 



Trichina, 645, 647 



Tricliinella spiralis, 647 



Trichinosis, 646. 647 



Trie hoc ysts, 57G 



Trichogyne, 601 



Trilobita, 654, 656-57 



Triphosphopyridine nucleotide (TPN), 145, 162, 

 163, 165 



Triose phosphate, 151. 165 



Triplets, identical, 499, 503 



Trisomy, 507 



Tritium. 142 



Tropisms. 263-64 



Tropmyosin, 439 



True colony, 55 



True fats, 81-82, 137 



Trypanosoma gambiense, 627 



Trypanosomas. 627 



Trypsin. 102, 104, 108, 312, 408 



Tripsinogen, 312 



Tsetse fly, 627 



TSH (see Thyrotrophin) 



Tubeworms, 649 



Tubules, nephric, 384: seminiferous, 383, 384 



Tumor cell, paired centrioles of, 4.5 



Tumors. 48-49; benign, 48 



Tunicata, 593, 665, 666 



Turbellaria, 637 



Turgor, 119; movements, 259-61, 262 



Tinner syndrome, 507. 508 



Twins, fraternal, 395, 499, 502, 510; identical 



395, 499, 502, 510 

 Twitch, single, 433-34 

 Tympanic cavity, 425 

 Typhoid bacillus, 20 

 Typhus. 602 

 Tyraniwsaunts rex, 568 

 Tyrosine, 306, 312 



U 



I 'linns americana, 249 



Vlothrix, 57, 59. 236, 596. 597 



I liracentrifuge, 9 



Viva. 596, 597 



Umbilical cord, 392, 393 



Ungidata, 676 



Universal donor, 325 



Uracil, 525 



Uranium, 564 



Urea, 138. 177. 369: formation, deamination and. 

 341-43 



Urease, 100 



Ureter. 383, 384, 387 



Urethra, 384, 385. 387 



Urey, U. C, 186 



Uric acid, 342 



Urine, formation of. 373; nephric filtrate com- 

 pared to. 374 



I ' i m hordata, 665 



Urogenital canal. 38.3, 384 



1 'rogenital system, 383 



Uterus, 383, 387, 388, 390-93 



Uvula, 298 



V 



Yacc ines, 579 



Vacuolar membrane. 31 



Vacuoles, 23. 28. 121; cell sap, 30; contractile. 



29. 119. 123. 369: cytoplasmic, 29-30; food. 



128, 129; gastric, of primitive Metazoa, 291- 



92: phagocytic, 30, 121-22: pinoevtic, 30. 121- 



2° 

 Vagina. 387, 388. 394 

 Vagus nerves, 305 

 Valence number, 69 

 Van Kiel, C. B., 161 

 Vaporization, heat of, 72 



Variations, genetic vs. environmental. 513-17 

 Vas deferens, 383, 384, 385 

 Vasa cllcrentia. 383, 384 

 Vascular bundles, 247-48 

 Vascular plants, 611-21; leaf and its functions. 



