Index 893 



Tissues — Cont'd 



xylem, 56, 57,* 59, 191-198, 197,* 



207-216, 220, 223* 

 yellow elastic fibrous, 49, 50* 

 Toad, 333, 333,* 336,* 340, 573 

 Tolles, 31 

 Tongue, 469,* 473 

 Tooth shell, 314, 316* 

 Toxin, 659, 772 

 Tracers, 82 

 Trachea, 318, 319, 325,* 396,* 397, 



397,* 403,* 407, 434, 469,* 



470,* 490,* 492 

 Tracheophyta, lio' 133-148, 191-198, 



200-205, 206-213 

 Trails, 605, 611 

 Transformation, 860 

 Translocation, 680, 860 

 Transmutation, 860 

 Transpiration, 226, 227 

 Transportation, 240, 638 

 Traumatin, 240, 768 

 Travertine, 114, 152 

 Tree of life, 104 



respiratory, 306* 

 Trematoda, 293, 294, 373, 537 

 Trepang, 540 



Trial-and-error theory, 861 

 Trichinella, 295, 296,* 297, 298, 539, 



661, 785 

 Trichinelloidea, 297 

 Trichinosis, 295-299, 539, 661, 785 

 Trichocyst, 278,* 349, 350,* 353,* 354* 

 Trichogyne, 163,* 164, 165 

 Trihybrid cross in heredity, 686-690 

 Trilobite, 609* 

 Triploblastic, 292, 293, 295, 299, 306, 



309, 314, 325-343, 368, 373 

 Triploid, 207, 679 

 Trochanter, 394, 400, 401* 

 Trochelminthes (Rotifers), 297-299, 



299* 



Trochophore, 308 



Trophectoderm (trophoderm), 451,* 



452, 453 

 Trophozoite, 277,* 365,* 366 

 Tropisms, 242, 243, 861 

 Truncus arteriosus, 430, 430,* 741* 

 Trypanosome, 275, 532, 533,* 534, 



534* 



Trypsin, 429, 476 

 Tsetse fly, 534* 

 Tube cell, 202 



foot, 299, 300*-304,* 304 



nucleus, 207, 225* 

 Tubercle, 304* 

 Tumor, 180,* 583 

 Tundra, 599,* 600 

 Tunic, 327, 328* 



Tunicata, 327 



Turbatrix {see Vinegar eel) 

 Turbellaria, 293, 369* 

 Turgor, 754, 861 



Turtle, 337,* 340 {see also Reptilia) 

 Twinning in heredity, 717* 

 Two-, four-, eight-cell stages of em- 

 bryos, 444, 451* 



Tympanic, 398, 421, 438 

 Tyndall's cone, 77 

 Typhlosole, 386, 386,* 387* 

 Typhoid, 255 



U 



Ulothrix, 115,* 116, 154, 157 



Ultraviolet, 32, 33 



Umbilical, 451, 453, 455* 



Umbo, 312* 



Uniformitarianism, 961 



Unit character, 685 



Unity in living organisms, 646-657 



Uranium, 82 



Urea, 493 



Uredospore, 129, 167, 181, 182, 182* 



Ureter, 311,* 332,* 340,* 427,* 439,* 



440,* 492, 493,* 494, 514,* 



515* 



Urethra, 493,* 513, 514* 

 Uriniferous tubule {see Kidney) 

 Urochordata, 327, 328* 

 Uroglena, 530, 531* 

 Uropod, 320,* 321* 

 Urostyle, 423,* 424 

 Used spindle (mitosis), 65 

 Ustilago, 180* 



Uterus, 296,* 374,* 377,* 378,* 380,* 

 382, 440, 452, 455,* 514 



Utricle, 496 

 Utricularia, 668* 



V 



Vacuole, 40,* 43, 160, 162 



contractile, 156, 156,* 276,* 278,* 

 279,* 345,* 346, 350,* 354, 

 355, 358,* 359, 360, 362* 

 food, 279,* 344, 345,* 350,* 351, 

 352, 369 



Vagina, 311,* 312,* 374,* 378,* 380,* 

 382, 398,406, 514, 515* 



Valve, 159, 311, 395, 405, 477, 480* 

 Variations, 93, 721-731, 723*-728,* 

 736, 746 



Vas deferens (vasa deferentia), 311,* 

 312,* 371,* 372, 378,* 380,* 

 382, 389,* 391, 398, 406, 513, 

 514, 514* 



