No. 4, January, 1921] SOIL SCIENCE 291 



2016. Rigg, George B., and T. G. Thompson. Colloidal properties of bog water. Hot. 

 Gaz. 68:307-379. 1919. — Bog water gives a precipitate on standing a few hours after sat- 

 uration with electrolytes, or upon standing a year or more without electrolytes. The filtrate 

 from the precipitation wit h (Nil il^SOj, when dialyzed until free from sulpha! es, is not toxic to 

 the root hairs of Tradescantia cuttings; bog water, when dialyzed for tin' same length of time 

 as this filtrate, is loxic to these root hairs. The distillate from hog water gives no precipi- 

 tate with electrolytes, is much less acid than bog water, and is not toxic to these root hairs. 

 The concentrate obtained when bog water is distilled to approximately one-sixth of its origi- 

 nal volume gives a heavier precipitate with electrolytes than does hog water; it is also more 

 acid and toxic to these root hairs. The residue from complete evaporation of bog water 

 is a brownish powder which is soluble in cold water; insoluble in alcohol and gasoline, and 

 practically insoluble in ether; this water solution of the residue is toxic to the root hairs of 

 Tradescantia. No solid matter was thrown out of bog water by centrifuging. Chemical 

 analyses of Puget Sound bog waters give results similar to those reported for other American 

 bog waters. The toxicity of bog waters to Tradescantia cuttings seems to be connected with 

 the matter in it that is in a colloidal state. The oxidation of this toxic matter to non-toxic 

 matter seems to be a basis of agricultural practice in bringing bog lands into cultivation. — 

 Gbcorge B. Rigg and T. G. Thompson. 



2017. Schreiner, Oswald, B. E. Brown, J. J. Skinner, and M. SiiArovALOv. Crop 

 injury by borax in fertilizers. U. S. Dept. Agric. Dept. Circ. 84. 35 p. Fig. 1-25. 1920. — 

 See Bot. Absts. 6, Entry 1431. 



MISCELLANEOUS 



2018. Roberts, Herbert F. An improved colorimeter for color inheritance study. Plant 

 World 22: 262-269. 4 fig- 1919. — Improvements of the tintometer are described and illus- 

 trated. The instrument is said to be especially valuable in quantitative measurement of 

 color value in flowers, in a study of color inheritance, as in determining the color value of 

 segregates, and in quantitative color determinations generally. — C. A. Shull. 



SOIL SCIENCE 



J. J. Skinner, Editor 

 F. M. Schertz, Assistant Editor 



GENERAL 



2019. Free, E. E. The utility of soil surveys. [Rev. of : Pendleton, Robert Larimore. 

 Are soils mapped under a given type name by the Bureau of Soils method closely similar to one 

 another? Uni. California Publ. Agric. Sci. 3: 369-498. 1919.] Plant World 22: 272-274. 

 1919. 



2020. Gardner, Frank D., asst. by R. M. Blasingame. Soils and soil management. 

 6X9 inches, 223 p., 97 fig. John C. Winston Company: Chicago and Philadelphia, 1920. A 

 non-technical manual on the management of soil for the production and maintenance of fer- 

 tility, with a section on farm building and equipment. — J. J. Skinner. 



2021. Grumert, Artur. Anleitung zur Dranage. [Guide to drainage.] Landw. Hefte 

 39 and 40: 5-66. 1 pi., 38 fig. 1919. — A comprehensive treatise on the theory and practice of 

 agricultural drainage. — C. V. Piper. 



2022. KiiHR, C. A. H. von Wolzogen. Het zure bibitrot bij net suikerriet. [Sour 

 cutting-rot of sugar cane.] Arch. Suikerindust. in Nederlandsch-Indie 28:703-756. 24 fig. 

 1920.— See Bot. Absts. 6, Entry 1948. 



2023. Stead, Arthur. The agriculture and soils of the Cape Province. Jour. Dept. 

 Agric. Union of South Africa. 1 : 351-358. 1920. 



