INDEX 
639 
Tubers, 217 
Tubuliflorae, 488 
Tulip bulb, 29 
Tulip-tree, 29, 74 
Turgor, 58, 114 
Turpin, 98 
Tyndall, 89 
Type genus, 491 
Typhaceae, 491 
Typha latifolia, 490, 491, 492 
angustifolia, 490 
Typhoid fever, 310 
Mary, 310 
U 
Ulmus americana, 414 
Ulothrix, 352 
zonata, 354 
Ultricularia, 87, 88 
Umbelliferae, 471 
Umbels, 471 
Unconformity, 583 
Unit-c h a r a c t ers, character-units 
versus, 558 
Ustilago, 298 
A venae, 298 
maydis, 299 
Tritici, 298 
Zeae, 298 
Vaccination, 313, 314 
Vacciniacese, 473 
Vaccinium, 451, 473 
corymbosum, 452 
Vacuoles, 17 
Vallisneria spiralis, 349 
Van Tieghem, 598 
Variability, fluctuating. 525 
Variation, 189, 512 
continuous, 522 
discontinuous, 527 
Variation, fluctuating, and inheri- 
tance, 527 
Vascular plants, 153 
Vaucheria, 364 
terrestris, 356 
Venter, 169 
Ventral-canal cell, 1 70 
Venus's flytrap, 86, 88 
Verbascum Thapsus, 31, 130 
Verbena ciliata, 33 
Vernation, circinate, 152 
Vinegar, 317 
Vivum e vivo, omne, 89 
Von Mohl, Hugo, 15 
Vries, Hugo de, 520, 521 
W 
Wall-cell, 428 
Water and the soil, 54 
Water crowfoot, 460 
Water hyacinth, 51, 52 
Water importance of, 47 
plantain, 493 
requirement, relative, 47 
Webber, 404 
Wheat, smuts of, 297 
Wheat-sickness, 92 
White pine blister rust, 302 
Whorls, 412 
Wild cabbage, horticultural varie- 
ties of, 531 
Wieland, 597 
Wielandiella, 608 
Williamsonia, 602, 608 
Willow, 12, 117, 346, 457, 458 
weeping, 457 
Wilt disease of cotton and water- 
melon, 295 
cucumbers and melons, 309 
Wings, 1 66 
Witches' brooms, 292,293 
Wood lily, 436 
