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 Tadpole, 126, 134.

Tanner, Dr., 138.

Tapeworm, 49.

Tarantula, 94.

Taste, 110, 143, 146.

Tear gland, 149.

Teeth, 88, 98, 99, 111; of frog, 130.

Teleutospores, 192.

Temperature, 21; nerves of, 142, 146.

Tendon, 41.

Tendril, 101.

Terrapin, 143, 144.

Thallophyte, 181, 184.

Thallus, 184, 197.

Thompson, Sir Henry, on smoking, 87.

Thoracic duct, 64, 65, 105.

Thorns, 101.

Thought questions, 20, 27, 79, 107, 109, 116.

Thyrse, 160.

Thyroid gland, 97.

Tillandsia, 110.

Timber, decay of, 195.

Tissue, 7, 10,  60, 62.

Toad, 137.

Toadstool, 194.

Tobacco, and heart, 67; and lungs, 86; and taste, 148; when enjoyable, 87.

Tortoise, 140, 143, 144.

Torus, 134, 169.

Touch, 145,  119.

Toxin, 160, 161.

Toyi Niku, Madame, quoted, 141.

Trachea, 74.

Tracheid, 65.

Transpiration, 98, 103.

Trap-door spider, 94.

Tube feet, 35.

Tuberculosis, 5, 160.

Tumble bug, 90, 91.

Turtle, 140, 143, 144.

Twiners, 129, 131.

Typhoid fever, 159.

Umbel, 159.

Umbo, 98.

Undergrowth, 12.

Ungulate, 212.

Urea, 94.

Uric acid, 114.

Urinary tubule, 27.

Vacuole, 11, 12, 14.

Valve, 164,  51, 53, 57.

Vampire, 203.

Variation, 147,  2.

Variety, 8.

Vaso-motor nerves, 23, 68.

Vaucheria, 186.

Vegetables, 95, 112.

Venomous snakes, 143.

Vent, 42.

Ventilation, 71, 82, 83.

Ventral, 43.

Ventricle, 53.

Vermes, 9, 125.

Vermiform appendix, 4, 106.

Vertebra, 71, 82, 83.

Vertebrates, 9, 125.

Vertebrate skeletons, 218.

Verticellate, 84.

Vestigial organs, 106.

Villi, 104.

Vinegar, 94.

Viscera, 127; of bird, 163.

Vitreous humor, 152.

Voluntary act, 122, 124.

Warning sound, 147.

Wasps, digging, 89.

Water-pore, 88.

Waterworks, 163.

Weevil, 90, 91, 96.

Whale, 208.

Wheat rust, 192.

White corpuscles, 59; origin of, 61; work of, 60, 161, 162.

White weed, or ox-eye daisy, 155.

Whorled, 84.

Willow mildew, 190.

Wind travelers, 173.

Wings, of grasshopper, 67; of bird, 153, 158.

Woodpecker, 180.

Woody fiber, 17.

Worms, 42.

Wounds of plants, 56.

Written exercises, 15, 50, 116.

Yeast plants, 190,  158.

Yellow fever, 160.

Yellow spot, 151.

Zoology defined, 1.

Zoophytes, 33.

Zygnema, 185.

Zygospore, 185, 189, 181, 189.