748 



AUTHORS' index 



Wiley, H. W., Estimation of organic 



matter, 143, 144. 

 Mechanical soil analysis, 84, 92. 

 Soil analysis, 338. 

 Willcox, O. W., Soil survey of Iowa, 718. 

 Williams, H. F., Soil-forming minerals, 



100. 

 Williams, M. B., Irrigation in humid 



regions, 690. 

 Wilson, H. M., Irrigation engineering, 



692. 

 Wing, H. H., Losses of manure, 599. 



Production of manure, 587. 

 Winton, A. L., Commercial fertilizers, 



564; 

 Wolff, E., Composition of manure, 595. 

 Wollny, E., Capillary movement, 226, 



228, 230. 



Wollny, E., Capillarity and temperature, 

 214 

 Color and temperature, 302. 

 Composition of soil air, 139. 

 Effect of earthworms, 422. 

 Gravitational movement of water, 



234. 

 Optimum moisture, 262. 

 Roots and humus, 127. 

 Slope and temperature, 319. 

 Water requirements of plants, 246. 

 Water and soil temperature, 315'. 

 Woodward, S. M., Land drainage by 

 pumping, 627. 



Yoder, P. A., Centrifugal elutriator, 89. 



Zsigmondy, R., Colloid chemistry, 153. 



