142 INDEX. 



I'age 



Vei-bascum 62 



Verbena 60 



VerbenaceJK 60 



Vernonia 64 



Veronica 62 



Vei'va in (>0 



Vervain family 60 



Vesicular lava, absorption of water by 98 



Vetch 53 



Viburnum 64 



Vicia ' •■ . 53 



Viola 56 



Violacea; 56 



Violet 56 



Vitaceae 55 



Vitis 55 



Volcanic island, life history of 92-10] 



Volcanic rocks, destruction by weathering 97 



Volvox. reproduction in 13 



Volvulus 59 



Vorticella, fertilization of 1- 



W. 



AVahoo 54 



Wake-robin "11 



Walnut family 43 



Washingtonia 57 



Water beech 44 



Water cress 49 



Water crowfoot 48 



Water hemlock 58 



Water horehound fil 



Water-leaf family fiO 



Water-lily family 47 



Watermelon (>4 



Water milfoil family 57 



Water moccasin, reference to paper on 6 



Water nymph family 35 



Water parsnip . 57 



Water plantain family 35 



Weathering of volcanic rocks 97 



Wheat 38 



Wheat grass 38 



AVheeler, C. F., on testing seeds in moist air. reference 6 



on distribution of the prickly pear in Michigan, reference 6 



White ash 59 



White avens 51 



White charlock •, 49 



White clover 52 



White goldenrod 65 



White grass 36 



White melilot 52 



White mustard 49 



Whitewood 48 



Wilbur, Itr. Cressy L.. reference to paper by 6 



Wild Basil 61 



Wild bergamot 61 



Wild black currant 50 



Wild columbine 47 



Wild ginger 44 



Wild gooseberry 50 



