522 EXPEKIMENT STATION RECORD. 



31-^9). — This is a general popular cliscussiou of the bearing of bacterial ac- 

 tivity on soil fertility with reference to " clover sickness '' and other conditions 

 affecting the growth of this plant. 



Denitrification, Behn {Jahresher, Augeic. Bot.,3 {1904-5), pp. 137-165). — 

 This is a review of the development and present status of the denitrification 

 question. 



On the conservation of nitrogen in manure, T. Macfarlane {Proc. and 

 Trans. Roy. Soc. Canada, 2. ser., 12 {1906), Sec. Ill, pp. 37-43, figs. 2).— This 

 is a brief account of a continuation of previous experiments (E. S. R., 17, p. 

 345). The experiments reported in this article were made to test the effect of 

 treatment with nitric and sulphuric acids and artificial heat on the recovery 

 of nitrogen. The results indicate that " a complete recovery of the nitrogen 

 in urea is quite possible if a certain quantity of acid is used and the water is 

 expelled gradually by artificial heat." Other experiments indicated " that in the 

 spontaneous evaporation of urine and the decomposition of its urea all the nitro- 

 gen is not eliminated in the form of ammonia, otherwise it would have been 

 retained by the large amount of acid used." 



Chicken manure as fertilizer, A. Mankovski (Selsk. Khoz., 22, No. 10; abs. 

 in Zhiir. Opuitn. Agron. [Russ. Jour. Expt. Landic], 8 (1907) No. 2, p. 206). — 

 The application of chicken manure suitably pulverized and sifted gave satis- 

 factory results with wheat and millet, and with beets, cucumbers, squashes, 

 and potatoes. 



Artifi^cial fertilizers: Their nature and functions, A. D. Hall (Sci. Amer. 

 Sup.. 63 {1007), Xos. 16',0, pp. 26273, 2627.'i, fig. 1; 16J,l, pp. 26293-26295; 1642, 

 pp. 26310,26311; 1643, pp. 26318,26319 ; 64 {1907), No. 1644, PP- 13-15, fig. 1).~ 

 A reprint. The original has been noted (E. S. R.. 18. p. 921). 



Experiments on the application of artificial fertilizers on the chernozem of 

 the Voronej Government, M. S. Karpov {Vycstnik Sclsk. K]ioz., 1906, 

 No. 39; abs. in Zhur. Opuitn. Agron. [Russ. Jour. Expt. Landtc], 8 (1907), No. 

 2, pp. 210, 211). — The author reports the results of the application, in field 

 experiments on chernozem, of 30 per cent potash salt, superphosphate, nitrate 

 of soda, ashes, and manure (in different combinations) under winter rye and 

 wheat. The experiments indicate in general the profitableness of the use of 

 mineral fertilizers under the given conditions. 



Experimental field of the Moscow Agricultural Institute, 1903-1905, A. A. 

 Kaluzhski (Isv. Moscov. Selsk. Khoz. Inst. [Ann. Inst. Agron. Moscou], 12 

 (1906), No. 3, pp. 308-399, pi. 1). — This report is divided into six parts treating, 

 respectively, of winter cereals, summer cereals, grasses, potatoes, experiments 

 with fertilizers, and experiments with straw. Fertilizer experiments with oats 

 are described in which the effect of wood ashes was tested. It was found that 

 moderate quantities of ashes (267.19 lbs. per acre) considerably inci'eased the 

 yield, while larger quantities caused a falling off in yield. Straw (rye), dry 

 and comminuted, plowed under oats and rye lowered the yield. 



Experiments to test the applicability of certain new fertilizing materials 

 (Deut. Landw. Pressc, 34 (1907), No. 65, pp. 525, 526).— Experiments with 

 agricultural lime and nitrogen lime by Petersen at the experiment station of 

 Oldenburg in 1906 are briefly reported. 



The use of calcium cyanamid in sugar-beet culture, A. Aulard (Bui. Assoc. 

 Chini. Sucr. ct Distill., 24 (1907), No. 12, pp. 1653-1660; abs. in Chem. Zentbl., 

 1907, II, No. 19, p. 1651). — This is a brief note referring to a compilation of 

 results of experiments in different countries, but especially in Italy. It is 

 stated that the results show in general that the calcium cyanamid compared 

 favorably with sodium nitrate and ammonium sulphate as a nitrogenous ferti- 



