No. 2, March, 1921] SOIL SCIENCE 205 



1382. Krogh, August. A gas analysis apparatus accurate to 0.001 per cent, mainly de- 

 signed for respiratory exchange work. Biochem. Jour. 14: 267-281. 4 fig- 1920. 



1383. Martin, Charles James. The preparation of Sorensen's phosphate solutions when 

 the pure salts are not available. Biochem. Jour. 14: 98. 1920. 



1384. MuTSCHELLER, ARTHUR. CoUoidal adsorption. Jour. Amer. Chem. See. 42: 2142- 

 2160. 1920. 



1S85. ScHMiT- Jensen, Hans Oluf. Estimation of carbon dioxide, oxygen and combustible 

 gases by Krogh's method of micro-analysis. Biochem. Jour. 14: 4-24. 2 fig. 1920. — A detailed 

 description is given of Krogh's method as modified by the author. Special emphasis is placed 

 upon the value of the method in biological work. — Alva R. Davis. 



SOIL SCIENCE 



J. J. Skinner, Editor 

 F. M. ScHERTZ, Assistant Editor 



GENERAL 



1386. Alway, F. J. Agricultural value and reclamation of peat soils. Minnesota Agric. 

 Exp. Sta. Bull. 188: 1-136. 54 fig. Mar., 1920.— The peat soils of the state are divided into 

 groups of high and low lime content. On the high lime peats, applications of lime are of no 

 advantage and sufficient nitrogen becomes available as farm and garden crops need this ele- 

 ment. The high lime peats are classed according to their need for chemical fertilizers. Low 

 lime peats need both lime and nitrogen applications. Ascertaining the fertilizer requirements 

 of individual tracts is always advisable. Drainage, water level control, and heavy rolling 

 are necessary. Burning is advised only after careful consideration of the local conditions. 

 — Extensive drainage of peat soils before reclamation operations are to be started is inad- 

 visable. The advisability of entering on reclamation work with peat depends upon location 

 and facilities for operation. — A. C. Amy. . 



1387. Bear, Firman E. Chemical analysis of soils, Ohio Agric. Exp. Sta. Monthly 

 Bull. 58 : 227-232. 1920.— Chemical analyses of soils are valuable as a guide to the planning 

 of permanent systems of soil improvement, as an index to the direction in which the supply 

 of plant food is moving, as a basis for interpretation of experimental data from different soils, 

 as a guide to the application of results obtained on experimental farms and gives definite infor- 

 mation as to the potential fertility of a soil. — R. C. Thomas. 



1388. [C, C] Soils and manures. [Rev. of: Wild, L. J. Soils and manures in New 

 Zealand. 134 p. Whitcombe and Tombs: Auckland, Melbourne and London, 1919. Also of: 

 Russell, E. J. A students' book on soils and manures. 2nd ed., XII + 240 p. University 

 Press: Cambridge, 1919]. Nature 105: 130-131. 1920. 



1389. Clarke, Frank Wigglesworth. The data of geochemistry. U. S. Geol. Surv. 

 Bull. 695. 832 p. 4th edition. 1920.— The chemical constituents of the earth's crust are 

 given together with certain general conclusions. — C. V. Piper. 



1390. CoLLiNSON, R. C. A progress report of fertilizer experiments with fruits. New 

 York Agric. Exp. Sta. [Geneva] Bull. 477. 53 p. 1920. 



1391. Findlay, Hugh. The handbook for practical farmers. 558 p., 258 fig. D.Apple- 

 ton & Company: New York and London, 1920. See Bot. Absts. 7, Entry 609. 



1392. FoRTiER, S. Relation to orchard irrigation practice. Monthly Bull. California 

 State Commission Hortic. 7 : 361-367. 1919.— Arid soils in general and orchard soils in particu- 



