382 SOIL CONDITIONS AND PLANT GROWTH 



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263. Shorey, E. C., Fry, W. H., and Hazen, W., " Calcium Compounds in 



Soils," Journ. Agric. Research, 1917, viii., 57-77 (see also Schreiner, 



O.) 121 



264. Shull, C. A., " Measurement of the Surface Forces in Soils," Botanical 



Gazette, 1916, Ixii., 1-31 224 



265. Shutt, F. T., "Some Characteristics of the Western Prairie Soils of 



Canada," journ. Agric. Sci., 1910, iii., 335-57 ... 44, 181, 310 



266. Sibert/ev, " Genetic Classification of Soils," Tulaikoff, N. M., ibid., 



1908, iii., 80-85 303 



266a. von Sigmond, Alexius A. J., " Beitrage zur ausfiihrlichen chemis- 



chen Analyse des Bodens," Internal. Mitt. Bodenkunde, 1914, iv., 

 336-62 344, 352 



267. Sigmund, Wilhelm, " Ueber die Einwirkung chemischer Agentien auf 



die Keimung," Landw. Versuchs-Stat., 1896, xlvii., 1-58 ... 86 



268. Snyder, Harry, (a) The Chemistry of Soils and Fertilisers, Easton, 



Pa., 1899 138 



(b) " Loss of Nitrogen by Continuous Wheat Cropping," Minnesota 

 Bull. 53, 1897 181 



269. Sohngen, N. L., "Einfluss von Kolloiden auf microbiologische 



Prozesse," Centr. Bakt. Par., 1913, xxxviii., 621-47 .... 239 



270. Sprengel, Carl, (a) "Ueber Pflanzenhumus, Humussaure und humus- 



saure Salze," Kastner Archiv fiir die gesamte Naturlehre, Niirnberg, 



1826 129 



(b) Ch'tniefur Landwirthe, Forst manner und Cam eralisten, Gottingen, 

 1832 14 



271. Stevens, F. L., and Withers, W. A., (a) " Ammonification in Soils 



and in Solutions," Kept. Div. Biol. North Carolina Expt. Stn., 



1909, xxxii., 119-28 263 



(b) "The Inhibition of Nitrification by Organic Matter Compared in 



Soils and in Solutions," Centr. Bakt. Pa''., Abt. II., 1910, xxvii., 

 169-86 190 



272. Stiles, W., and J^rgensen, I., " Observations on the Influence of Aera- 



tion of the Nutrient Solution in Water Culture Experiments, etc.," 

 New Phytologist, 1917, xvi., 181-97 5 1 



273. Stoklasa, Julius, and Ernest, Adolf, (a) " Ueber den Ursprung, die 



Menge, und die Bedeutung des Kohlendioxyds im Boden," Centr. 



Bakt. Par., II., 1905, xiv., 723-36 177, 199, 269 



(b) Stoklasa, Julius, " Methoden zur Bestimmung der Atmungsinten- 

 sitat der Bakterien im Boden," Ztschr. Landw. Versuchsiv. Osttrr., 

 1911, xiv., 1243-79 177 



274. Stoklasa, Julius, and Ernest, Adolf, " Treten Stickstoffverluste im 



Boden ein bei Diingung mit Chilisalpeter," Centr. Bakt. Par., II., 

 1907, xvii., 27-33 209 



275. Stoklasa, Julius, and Ernest, Adolf, " Die chemische Charakter der 



Wurzelausscheidungen verschiedenartiger Kulturpflanzen," Jahrb. 



wiss. Bot., 1908, xlvi., 52-102 233 



(b) Stoklasa, Julius ; Ernest, Adolf ; Strariak, Franz ; and Vitek, 

 Eugen, " Beitrag zur Kenntnis der chemischen Vorgange bei der 

 Assimilation des elementaren Stickstoff durch Azotobacter und 

 Radiobacter," Centr. Bakt. Par., Abt. II., 1908, xxi., 484-509 and 

 620-32 197, 198, 199 



