326 SOIL SCIENCE [BoT. Absts., Vol. VIII, 



2215. Marchand, B. de C. Chemical analysis of soils. Jour. Dept. Agric. Union of 

 South Africa 1: 341-348. 1920. — The author annotates in detail the information contained 

 in a "complete soil analysis" and in a partial analysis to determine manurial needs. — E. M. 

 Doidge. 



2216. Marchand, B. de C. Representative Transvaal soils 1. The Koedoespoort Red 

 Loam. Jour. Dept. Agric. Union of South Africa 1: 722-727. 1920. 



2217. MtJNTER, F. Die Zuckerriibe als Boden analysatorim. [The sugar beet as soil 

 analyzer.] Mitteil. Deutsch. Landw. Ges. 35: 313-314. 1920.— The author points out that 

 while a chemical analysis of plants generally does not yield information of value regarding 

 the fertility of the soil, the sugar beet may be used in a limited way to determine whether 

 or not potassium or phosphoric acid is present in the soil in sufficient quantities. From 

 tables of analyses he concludes that if, on soil in which there is ample nitrogen, the percentage 

 of potash in the plant exceeds that of nitrogen, there is sufficient potash in the soil; if it is 

 less, there is not enough for the plants. If, on similar soil, the ratio of nitrogen to phosphoric 

 acid is greater than 100:20, phosphoric acid is needed; if the ratio is less, phosphoric acid is 

 present in sufficient quantity. — A. J . Pieters. 



2218. Smit, B. J. Representative Transvaal soils, II. Pretoria quartzite sandy soils. 

 Jour. Dept. Agric. Union of South Africa 2: 170-176. 1921. 



2219. Stead, Arthur. The agriculture and soils of the Cape Province, 1. Jour. Dept. 

 Agric. Union of South Africa 1: 152-158. PL 1-2, map. 1920.— An account is given of the 

 Witkop district in the Stormburgen, with reference to its climatic conditions, potato and wheat 

 culture, and principal types of soils. — E. M. Doidge. 



2220. Stead, Arthur. The agriculture and soils of the Cape Province IV. Witkop 

 Burghersdorp. Jour. Dept. Agric. Union of South Africa 1: 660-670. PI. 6-7. 1920. 



2221. Stead, Arthur. The agriculture and soils of the Cape Province V. Witkop- 

 Burghersdorp. Jour. Dept. Agric. Union of South Africa 1: 819-828. PI. 8-10. 1920. 



2222. Stead, Arthur. Brak in its relation to irrigation. Jour. Dept. Agric. Union of 

 South Africa 1 : 13-25. PI. 1-4. 1920.— Where the rainfall is so light that irrigation is neces- 

 sary the soil contains more or less brak. Directions are given for the irrigation of brak soils, 

 and for the use of brak waters in irrigation. Crops which are deep rooted and which shade 

 the land are best for brak lands because they prevent evaporation at the surface. — E. M. 

 Doidge. 



2223. Thompson, H. C. Experiments with muck soils in growing greenhouse crops. Jour. 

 Amer. Peat Soc. 14: 45-63. 1921.— Lettuce, cauliflower, tomatoes, carnations, and roses 

 were used to test muck as a greenhouse soil. A chemical analysis does not give any indication 

 of the crop-producing capacity of a muck soil. — G. B. Rigg. 



2224. Weigner, Georg. Boden und Bodenbildung in koUoidchemischer Betrachtung. 

 [Soil and soil formation in the light of collodidal chemistry.] 15 x £2 cm., 98 p., 10 fig. Theodor 

 Steinkopff: Dresden and Leipzig. 1918.— A general treatise on the subject, reviewing the 

 late developments in colloidal chemistry and applying the principles of colloidal chemistry 

 to soil formations. — J. J. Skinner. 



