280 W. Wendler: Chemische Physiologie 1917— 1919 [24 



185. Leiningen-Westerburg, W. Graf zu. Wechselwirkung 

 •z w ischen Pflanzen und Bode n. (Verhandl. Zool.-Botan. Ges. Wien 

 1920, 69. p. [81] — [84].) — Siehe „Allgemeine Pflanzengeographie 1914—1921", 

 Nr. 336. 



186. Lipman, J. G. and Joffe. J. L. T h e inf luence o f initial 

 reaction o n t h e o x i d a t i o n o f s u 1 f u r and t h e formati o n 

 o f a v a i 1 ab 1 e phos p h a t e s. (Soil Science 10, 1920, p. 327—332.) 



187. Manquene, J. Les Papillonacees dans les sables de 

 Mostaganera (Alger ie). Recherches s u r 1 a formation des 

 tu bereu les rad'icaux. (Bull. Soc. Hist. Nat. Afr. Nord X, 1919, p. 66 

 bis 69). 



188. Mc Beth, J. G. Fixation o f a m m m o n i a in soil s, (Journ. 

 Agric. Res. 9, 1917. p. 141—155.) 



189. Mc Beth, J. G. Relation o f the t r a n s f o r m a t i o n and 

 distribution of soil nitro gen to the nutrition of Citrus 

 plante. (Journ. Agric. Res. 9, 1917, p. 183-252.) 



190. Mc Dool, M. M. and Wheeting, L. C. M ovement o f s o 1 u b 1 e 

 salts t h r o u g h s o i 1 s. (Journ. Agric. Res. 11, 1917, p. 531 — 547.) — 

 Conclusions: „1. The results presented show that soluble salts move from regions 

 of high to lower concentration in moist soils, tlie rate being rather rapid, and 

 therefore do not long remain localized, as reported by earlier investigators. 

 Moreover, the rate of movement is affected by the water content of the soil and 

 the mass of salt present. 2. Where moisture is being lost by evaporation, the 

 upward movement is more rapid than the downward translocation in heavier 

 soils; but in case of sands the downward translocation is indeed slight, thus 

 indicating that soluble salts, such as sodium nitrate, are more likely to be lost 

 by upward movement to the surface of sandy soils during a drought than in 

 case of heavier soils. 3. Chemical studies show that as the salts move through 

 the soil mass the Solution in the various layers of soil changes in composition. 

 Such changes, it seems, have an important bearing upon the results to be 

 obtained from the use of fertilizer salts, especially upon attempts to determine a 

 so-called balanced soil Solution by studies confined to a limited number of 

 soils. 4. The indications are that the translocation of soluble salts in soils is 

 brought about by means of diffusion, by reactions, that take place in the soil 

 and by moisture movements. 5. Field and laboratory experiments in progress 

 should throw additional light upon moisture movement in different soil classes, 



I?- well as the upward movement from the subsoil of substances in Solution.'' 



191. Mc Miller. Paul R. Inf luence of gypsum upon the 

 solubility of potash in soils. (Journ. Agric, Res. 14. 1918, 

 p. 61—66.) 



192. Miliar, C. E. Relation b e t w e e n biological a c t i v i ti e s 

 in the presence o f various salts and concentration o f 

 the soil Solution in different classes of soil. (Journ. 

 Agric. Res. 13, 1918, p. 213—223.) 



193. Miller, Edwin, O. and Coffman, W. B. Co m p a r a t i v e 

 transpiration o f com and the sorghums. (Journ. Agric. 

 Res. 13, 1918, p. 579— Ol »4. mit 2 Tai) 



194. Mockeridge. Florence, A. S o m e e f f e c t s o f organic 

 growth-pr o moting substances (a u x i in o n e s) o n the soil 



concerned in the n i t r o g e n cy c 1 e. ( Proc. Roy. Soc. 



