9o8 



Valsa leucostoiiia I54. 554 



— oxysloma 153, 558 



— prunastri Fr 558 



Faiida coenilea. Spot disease 263 



Vanilla. Grafting experiments 838 



Variegation 307, 677-84 



Varieties, Oecological 73 



Vegetables. Effect of tropical climate 



on growth 639 



— Over-fertilization 39^-93 



— Poor development in tropics 639 



reltheiinia (jlauca. Dying of the blos- 

 soms 297 



Vermicularia 54 



Verticillium riibcnimufu 204 



— Sacchari 227 



I'ibiirmim Opuliis 105 



/ 'icia Faba 80, 100 



Vinegar made from wine. Use in gum- 



mosis 707 



I 'iola arvensis 74 



— cucullata 75 



— tricolor 76 



Virescence 341 



Virulence. Theory 14 



Virus 684 



— Mosaic disease 687 



— See also Enzymes. 



Vitis. Bud cuttings 828 



— See also Grapes. 



litis z'inifera. Discoloration 280 



Viviparity 378 



Volcanoes, Injuries due to 751 



Volutella 54 



Waste lime 415 



causing dry rot 195 



heart rot 195 



Waste salts 401 



Waste water 748-55 



containing barium chlorid 752 



calcium chlorid 751-5^ 



cobalt 755 



iron sulfate 755 



magnesium chlorid 751-52 



nickel 755 



sodium chlorid 748-51 



zinc sulfate 75-2-53 



Water. Discoloration from alder bogs. 251 



— Excess 319-360 



— Scarcity. Top blight 189 



Cause of dwarfing 145 



— Use as a protection against frost.. 626 



Water, Stagnant 197, 199 



Water core of the apple 286-87 



— ends in the potato 163 



— lime 399 



— shoots 331 



— sprouts 331-3-2. 474 



Watering, Injudicious 206-208 



W^eakness. Parasites 15 



Weather. Effect 21-22 



Wedge cells 3^9 



Weeds. Soil shading 658 



W^en 863 



— Formation on the apple 882 



Whip grafting 837 



White lead. Injury 756 



White-leaf condition 307, 883 



Wilt disease of cotton 229 



Wilting 276-77 



— due to frost 548-51 



to injudicious watering 206 



— of foliage of root plants 365 



Wind 471-79 



— Effect 22, 462, 471-79 



on cocoa 472 



— Injury to leaves 477 



— Pruning action 474 



— Stunting of trees 474 



Wind, as protection against frost 627 



— Forest protection against 136 



W^ind-break 136, 471 



Wind-fall 471 



Winter frost 637 



— grain. Harrowing 236 



— lightning 486 



— moisture 189 



— seed. Harrowing 236 



— sunburn 648 



Witches brooms 146, 376 



Use of Chile saltpeter 391-92 



Wood. Swelling in tree 461 



W^ood, Curly 859 



— Gnarlv 859 



— Red 553 



Wood fibers. Spiral twisting due to 



constriction 817 



Woody plants. Discoloration 279-81 



Woolly streaks in apple cores 324-26 



Wound bark 792 



— glim 851-54 



— protection 850-51 



— stimulus 871, 885, 886 



— wall, Mobile 836 



— wood 772, 792 



Wounds 772-880 



— Overgrowth 783-87 



Wounds, Cleft 831 



— Gnawed 782 



— Rubbing 782 



Wounds due to grafting 831 



— due to resin gathering 780 



— to the axial organs 772-80 



Xanthium 176 



Xanthoria parictina cushions 330 



Yams. Favorable soil 232 



Yellow-leaf condition 192, 196 



due to excessive light 671 



Yellow sickness 307 



Yellow spots 434-35 



in Dracaena 435 



in Pamianus javanicus 434 



Yellowing due to grafting stock 284 



Zeoliths 265 



Zinc 740. 752 



— blend 752 



— oxid 752 



— salts 752 



— sulfate in waste water 752-53 



Zinnia I47 



