INDEX 



639 



Tubers, 217 



Tubuliflorae, 488 



Tulip bulb, 29 



Tulip-tree, 29, 74 



Turgor, 58, 114 



Turpin, 98 



Tyndall, 89 



Type genus, 491 



Typhacese, 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 



Avenae, 298 



maydis, 299 



Tritici, 298 



Zeae, 298 



Vaccination, 313, 314 



Vacciniaceas, 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 



