A SELECTED BIBLIOGRAPHY 385 



Page of text 

 on which 

 reference 

 is made. 



306. Whitney, M., "Soil Fertility," U.S. Dept. Agric. Bureau of Soils, 



Farmers' Bull., No. 257 172, 247 



307. Whitson, A. R., and Stoddart, C. W., " The Conservation of Phos- 



phates on Wisconsin Farms," Univ. of Wisconsin, Bull. 174, 1909 ; 



see also Bulls. 202, 204 and 205, all 1911 321 



308. Wiegner, Georg, " Zum Basenaustausch in der Ackererde," Jouvn.f. 



Landw., 1912, lx., 110-50; 197-222 156 



309. Wilfarth, (a) " Ueber den Nahrstoffverbrauch der Zuckerrube und die 



Beziehungen desselben zur Wasseraufnahme," Bied. Zent. Agric. 



Chew,., 1905, xxxiv., 167-69 49 



(b) Wilfarth, H., Romer, H., and Wimmer, G. " Ueber die Nahr- 

 stoffaufnahme der Pflanzen in verschiedenen Zeiten ihres Wach- 

 stums," Landw. Versuchs-Stat., 1905, Ixiii., 1-70 .... 297 



310. Willstatter, Richard, and Benz, Max, " Untersuchungen iiber Chloro- 



phyll, vi., Ueber krystallisirtes Chlorophyll," Liebig's Annalen, 

 1908, ccclviii., 267-87 75 



311. Winogradsky, S., (a) " Recherches sur les organismes de la nitrifica- 



tion," Ann. de rinst. Pasteur, 1890, iv., i e Memoire, 213-31 ; 2 e 



Memoire, 257-75 ; 3 e Memoire, 760-71 23, 189 



(b) Winogradsky, S., and Omelianski, " Ueber den Einfluss der 

 organischen Substanz auf die Arbeit der nitrifizierenden Mikrobien," 

 Centr. Bakt. Par., II., 1899, v., 329, 429 189 



312. Winogradsky, S., (a) " Recherches sur 1'assimilation de 1'azote libre 



de 1'atmosphere par les microbes," Archives des Sci. Biol., St. 



Petersburg, 1895, iii., 297-352 196 



(b) " Clostridium Pastorianum, seine Morphologie und seine Eigen- 

 schaften als Buttersaure ferment," Centr. Bakt. Par., II., 1902, ix., 

 43-54, 107-12 197 



313. Withers, W. A., and Fraps, Journ. Amer. Chem. Soc., 1901, xxiii., 318, 



and 1902, xxiv., 528 262 



314. Wojtkiewicz, A., " Beitrage zu bakteriologischen Boden- Unter- 



suchungen," Centr. Bakt. Par., 1914, xlii., 254-61 .... 279 



315. Wolff, E., and Kreutzhage, C., " Bedeutung der Kieselsaure fur die 



Entwicklung der Haferpflanze nach Versuchen in Wasserkultur," 

 Landw. Versuchs-Stat., 1884, xxx., 161-97 77 



316. Wolkoff, M. I., " Effect of Ammonium Sulphate in Nutrient Solu- 



tion on the Growth of Soy Beans in Sand Cultures," Soil Sci., 1918, 



v., 123-50 80 



317. Wollny, E., (a) " Untersuchungen iiber den Kohlensauregehalt der 



Bodenluft," Landw. Versuchs-Stat., 1880, xx*, 373-91 . . .175 

 (b) " Ueber die Thatigkeit mehrerer organismen in der Ackererde," 

 Bied. Zentr. Agric. Chem., 1884, xiii., 796-814 ... 26, 175 



318. Wollny, E., Die Zersetzung der Organischen Stoffe, 1897 . . .139 

 (A summary of Wollny' s work. For the papers by himself and his 



students see his Journal Forschungen auf dem Gebiete der agricultur 

 Physik, 1878 et seq.) 



319. Wood, T. B., "The Available Potash and Phosphoric Acid in Soils," 



Trans. Chem. Soc., 1896, Ixix., 287 234 



320. Wood, T. B., and Berry, R. A., "Soil Analysis as a Guide to the 



Manurial Treatment of Poor Pasture," Journ. Agric. Sci., 1905, i., 



114-21 2 34 



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