INDEX OF SUBJECTS 



897 



White clover, nodule bacteria of, 136 

 White sweet clover, nodule bacteria of, 



136 

 Wild indigo, nodule bacteria of, 136 

 Willia, 251 

 Wilts in soil, 807 

 Winter bacteria, 32 

 Wireworms, 361 

 Wood residues, influence of, upon plant 



growth, 518 

 Wood's clover, nodule bacteria of, 137 

 Worms in soil, 50, 341 



X ■ 



Xanthine in soil, 479, 671 

 Xanthophyll in algae, 215 

 Xylol, oxidation of, by bacteria, 97, 205 



Yeast, as a reducing agent, 171 

 in soil, 3, 11 



Yeast, reduction of nitrates by, 181 

 Yellow sweet clover, nodule bacteria 



of, 137 

 Yellow trefoil, nodule bacteria of, 137 

 Yellows, as influenced by soil environ- 

 ment, 811 



Zigzag clover, nodule bacteria of, 136 

 Zinc, transformation of, in soil, 666 

 Zooglea formation by nitrite-forming 



bacteria, 73 

 Zygodesmus, 255 

 Zygogonium, 229 

 Zygomycetes, 3, 247 

 Zygorhynchus, 248, 258, 259, 275, 642 



molleri, 260, 275, 379, 444 



vuilleminii, 495 

 Zygospore, isolation of, 246 

 Zymotic efficiency, 710 



