86 abstracts: agricultural chemistry 



cation of the general equation developed in the third section to 

 electro-capillary phenomena, to migration of suspended particles, and 

 to electric osmose. (5) The relation of absorption phenomena to 

 electro-capillary phenomena, to settling of suspensions, to formation of 

 electrolytic deposits, and to the behavior of disperse systems in general. 



H. E. P. 



AGRICULTURAL CHEMISTRY.— The color of soils. W. O. Robin- 

 son and W. J. McCaughey. Bulletin Bureau of Soils, No. 79. 

 Pp. 29. May, 1911. 



This bulletin treats of the causes of difference in color, particularly 

 of the red and yellow soils. It is concluded from the results of the iron 

 determinations and the mechanical analysis of twenty typical red and 

 yellow soils that the color is due to a colored film, mainly of iron and 

 aluminum oxides and organic matter, surrounding the soil particles. 

 A thin film gives a yellow color and a thick film a red color. Theoretical 

 considerations indicate that the iron oxide in various soils must be in 

 nearly the same condition of hydration. Miner alogical examination 

 shows that in general the minerals in the red soils have been subject to 

 more weathering than those of the yellow soils. Red soils are in general 

 older than yellow soils, and certain chemical characteristics show them 

 to be better drained. W. O. R. and W. J. McC. 



AGRICULTURAL CHEMISTRY.— The solubility of lime in aqueous 

 solutions of sugar and glycerol. F. K. Cameron and H. E. Patten, 

 Bureau of Soils. Journal of Physical Chemistry, 15: 67. 1911. 



(1) Solubility isotherms for lime in solutions of sugar and of glycerol 

 at 25° have been determined by direct analysis of the liquid phases. (2) 

 The solid phase in the system lime-sugar-water is one of a series of solid 

 solutions, with calcium hydroxide a limiting case. (3) The solid phase 

 in the system lime-glycerol-water at 25° is always calcium hydroxide. 

 (4) The increase in solubility of lime in aqueous solutions of glycerol 

 over that in pure water is directly proportional to the concentration of 

 glycerol. F. K. C. and H. E. P. 



AGRICULTURAL CHEMISTRY.— rfo theoretical basis for the use 

 of commercial fertilizers. Frank K. Cameron. Journal of Indus- 

 trial and Engineering Chemistry, 3: No. 3, March, 1911. 



Abstract of remarks made before the Division of Fertilizer Chemists 



