INDEX 



639 



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 

 UstUago, 298 



A venae, 298 



maydis, 299 



Tritici, 298 



Zese, 298 



Vaccination, 313, 314 

 Vacciniaceae, 473 

 Vaccinium, 451, 473 



corymbosum, 452 

 Vacuoles, 17 

 \'allisneria spiralis, 349 

 Van Tieghem, 598 

 Variability, fluctuating, 525 

 Variation, 189, 512 



continuous, 522 



discontinuous, 527 



fluctuating, and inheritance, 



527 

 ^'ascular plants, 153 

 Vaucheria, 364 



terrestris. 356 

 Venter. 169 



\'entral-canal cell, 170 

 ^'enus's flytrap, 86, 88 

 Vcrbascum Thapsus, 31, 130 

 Verbena ciUata, 33 

 Vernation, circinate, 152 

 Vinegar, 317 

 Vivum e vivo, omne, 89 

 \'on Mohl, Hugo, IS 

 Vries, Hugo de, 520, 521 



\V 



WaU-ceU, 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 

 WUliamsonia, 602, 608 

 WiUow, 12, 117, 346, 4S7i 458 



weeping, 457 

 Wilt disease of cotton and water- 

 melon, 29s 



cucumbers and melons, 309 

 Wings, 166 



Witches' brooms, 292,293 

 Wood lily, 436 

 Woodwardia orientalis, 351, 352 



X-chromsome, 359, 360 



