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 

 Umbelliferse, 471 

 Umbels, 471 

 Unconformity, 583 

 Unit-c h a r a c t ers, character-units 



versus, 558 

 Ustilago, 298 



Avenae, 298 



maydis, 299 



Tritici, 298 



Zeas, 298 



V 



Vaccination, 313, 314 

 Vacciniaceae, 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, 170 

 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, 166 



Witches' brooms, 292,293 

 Wood lily, 436 



