WATER SOILS. 679 



best divided into 2 eqiial jiarts; if orer 200 cc, into 3 ecjual parts, etc., adding water 

 if necessary, to render ali([noting simple. We now take one-half or one-third, etc., 

 as the case may be, and transfer to Kjeldahl llask, acidify with pure concentrated 

 sulphuric acid, and boil down until nearly all the water has been evaporated. The 

 llask is then cooled, and sufficient sulphuric acid and mercuric oxid are added to 

 determine the nitrogen in the usual way by the Kjeldahl method. In the distilla- 

 tion, 10 to 20 cc. tenth normal hydrochloric acid is used in the receiver with methyl 

 orange as an indicator. 



"Each cubic centimeter of acid used is equivalent to 0.0014 gm. of nitrogen. The 

 percentage of nitrogen in the soil calculated on the percentage of humus in the soil 

 gives the nitrogen in humus." 



Analyses of waters (California Sta. Bpt. 1S95, pp. U2-111). — Sanitary and mineral 

 analyses of 4it samples of stream, lake, spring, and well waters. 



Naturally faulty lands and their correction, E. W. Hilgard {California Sta. 

 lipt. ISDo, pp. lli-llS). — I'nproductivencss due to hardpan and dry sandy surface 

 soil is discussed, and means of overcoming it are explained. 



Perris Valley, Riverside County, California {California Sta. lipt. 1895, pp. 

 15-21). — Notes on the soil and climatic conditions of this region, and tabulated 

 analyses of soils and well waters of the region. 



A study of the Oxford soils of the southern part of the province of Oran, 

 C. Brioux {Ann. Agron., 23 {1S97), No. l,pp. 42-46). 



Experiments on the -water capacity of the soil {Deut. landw. Preside, 23 {1896), 

 No. 102. p. 910). 



The state of tension of -water and air in the soil, H. Puchner {Fomch. Geb. agr. 

 Fhys., 19 {1S96), No. 1-2, pp. 1-19). 



Humus and soil fertility, H. Sxyuer {Ann. Agron., 22 {1896), No. 12, pp. 531-564). — 

 Translated from U. S. Dept. Agr. Yearbook 1895, p. 131, by Marcille. 



The supply of soil nitrogen, E. W. Hilgard {California Sta. Ilpt. 1895, pp. 

 32-35). — A popular discussion of the sources and means of conserving and increas- 

 ing the supply of nitrogen in the soil. The importance of green manuring is 

 pointed out and attention is called to a foreign leguminous plant, Tetragonolobus 

 purpureiis, for which the name sijuare-pod i)ea is proposed. The station has tested 

 this plant to some extent and it appears to be well adajited to California condi- 

 tions. The richness of the humus of arid regions in nitrogen and the presence of 

 nitrates in alkali are also noted. 



The acidity of upland soils, H. J. Wheeler et al (Ann. Agron., 22 {1896), No. 

 12, pp. 564-570). — Translated from Rhode Island Station Eeport for 1895, by E. 

 Demoussy. 



Analyses of specimens of alkali {California Sta. Bpt. 1895, pp. 69-71). — The 

 results of examinations of 11 samples are reported. 



Rocks, clays, marls, coals, and plants {California Sta. Bpt. 1895, pp. 112,113). — 

 A list of such materials sent to the station for identification. 



Examination of soils {California Sta. Bpt. 1895, pp. 13-23). — Mechanical and 

 chemical analyses are given of 4 samples of soil from PtTris Valley, 1 from Ventura 

 County, and 1 from llollister, with a list of samples sent to the station for 

 examination. 



Late progress in soil examination, E. W. Hilgard {California Sta. Bpt. 1895, 

 pp. 23-32, pi. 1). — This paper was read before the Association of American Agricul- 

 tural Colleges and Exiieriment Stations at Denver, Colorado, August, 1895 (E. S. 

 R., 7, p. 178). 



