538 EXPERIMENT STATION RECORD. 



On the self-purification of soils, G. Riegler (Arch. Syg., 30 (1897), p. SO; dbs. in 

 Chem. Ztg., 21 (1S97), No. 83, liepert., p. 223). 



The importance of chemical soil analysis in the selection of farms and the 

 Kamerun soils, F. Wohltmakn et al (Ztschr. Trop. Landw., 1 (1S97), No. 3, pp. BI- 

 BB, jig. 1). — This article refers to methods and results reported elsewhere, 1 and dis- 

 cusses the value of chemical analysis in selecting soils for agricultural purposes, 

 especially as illustrated in the case of the Kamerun and other East African soils 

 examined by the authors. 



The results of chemical examination of German East African soils, F. 

 Wohltmann et al (Ztschr. Trop. Landw., 1 (1897), No. 6, pp. 129-133, tab. 1).— The 

 results of examination of a large numher of soils of this region which have been 

 published elsewhere 1 are here summarized and discussed. The analyses show that 

 the soils of the Kamerun Mountains are almost uniformly rich in fertilizing con- 

 stituents, although analyses of soils from other regions in East Africa show that the 

 soils are generally poor in plant food. It is evident that great care must be exer- 

 cised in the selection of soils for agricultural purposes in this region. 



The object and advantages of deep culture, Tancre (Landw. Wchnbl. Schleswig- 

 Holstein, 47 (1897), No. 43, pp. 619-621). 



FERTILIZERS. 



Commercial fertilizers (Cofinecticut State Sta. Rpt. 1896, pp. 

 81-177). — A statement of the amount of fertilizers used in Connecticut 

 in 1896; an abstract of the State laws relating to fertilizers; a list of 

 manufacturers complying with the fertilizer law; notes on the sampling 

 and collecting of fertilizers; explanations concerning the analysis and 

 valuation of fertilizers; a review of the fertilizer market for the year 

 ending November 1, 1896, by E. H. Jenkins; notes on the use of tables 

 of analyses of fertilizers and fertilizer chemicals, by E. 11. Jenkins; 2 

 and tabulated analyses and valuations of 492 samples of fertilizing 

 materials classified as follows: (1) raw materials containing nitrogen 

 as the principal ingredient — nitrate of soda, sulphate of ammonia, 

 dried blood, horn and hoof, cotton-seed meal, linseed meal, castor pom- 

 ace, mustard-seed cake, and preparations of leather; (13) raw materials 

 containing phosphoric acid as the principal ingredient — odorless phos- 

 phate, dissolved boueblack, and dissolved rock phosphate; (3) raw 

 materials containing potash as the principal ingredient — high grade 

 sulphate of potash, double sulphate of potash and magnesium, phos- 

 phate of potash, muriate of potash, and "potash salts ;" (4) raw materials 

 containing nitrogen and phosphoric acid — bone manures, tankage, and 

 fish; (5) mixed fertilizers — bone and potash, nitrogenous superphos- 

 phates, special manures, and home mixtures; (6) miscellaneous fertiliz- 

 ers and manures — cotton-hull ashes, wood ashes, limekiln ashes, tobacco 

 stems and dust, muck, peas, and beans. 



The results of inspection show the percentage of nitrogen in nitrate 

 of soda (12 samples) ranged from 15.53 to 16.21; the price per pound of 



1 Jour. Landw., 44 (1896), p. 211 (E. S. R., 8, p. 573). 



-See also Connecticut State Sta. Bui. 122 (E. S. R., 8, p. 122), 



