SOILS FERTILIZEES. 423 



efficieucy and the future possibilities of the EYank and Caro and Birkeland 

 and Eyde processes of preparinj? nitrogenous compounds are discussed. At- 

 tention is also called to the progress which has been made by Frank, Caro, 

 and Mond in utilizing peat for the production of power and of ammonia, as 

 well as the ai)plication of the Mond and other processes for the recovery of 

 ammonia from the gases of coke ovens, furnaces, etc. 



The synthetical production of foods and feeding stuffs and the application of 

 chemistry in the preparation of foods from new sources and increasing the 

 production from old sources are briefly referred to. 



The fixation of nitrogen, N. Whitehouse {Jnui: 8oc. Chem. Indus., 26 

 (1907), No. 13, pp. 7.38, 739). — A study of various methods with a view to 

 working out a practical commercial process for the fixation of atmospheric 

 nitrogen as ammonia or nitrate, using a metallic nitride as the nitrogen 

 carrier, is briefly reported. The results are mainly of theoretical interest. 



On the oxidation of nitrogen by the action of silent discharges on atmos- 

 pheric air, E. Warburg and G. Leithauser {Sitzber. K. Preuss. Akad. Wiss., 

 1907, Xo. 11-13, pp. 229-23.'f, figs. 2). — The investigations here reported show 

 that the product of the oxidation of dry atmospheric air by silent discbarges is 

 mainly N-Os. 



On the formation of calcium cyanamid and calcium carbid, E. Rudolfi 

 {ZtscJir. Anorgan. Chem., 54 (1907), No. 2, pp. 170-184, fig. 1; ahs. in Chem. Ztg. 

 31 (1907), No. 58, Repert. No. 53, p. 351). — Studies of the formation of calcium 

 cyanamid by the action of nitrogen on crude carbid with and without addition 

 of other substances (calcium chlorid, fluorid, iodid) and from the components 

 lime, charcoal, and nitrogen, are reported. Incidentally the equilibrium tem- 

 peratures of Rothmund for the formation of calcium carbid out of lime and 

 chai'coal were investigated and found too low. 



The formation of lime nitrogen, F. Foerster and H. Jacoby {Ztschr. Elek- 

 trochcni.. 13 (1907), No. 12, pp. 101-107; abs. in Jour. Soc. Chem. Indus., 26 

 (1907), No. S, p. 423). — Studies of the influence of temperature and of adding 

 calcium chlorid and fluorid are reported. 



Contributions to the study of calcium -phosphates, H. Bassett, Jr. (Ztschr. 

 Anorgan. Chem., 53 (1907), No. 1, pp. 34-62). — Studies of the hydrates of the 

 calcium hydro-orthophosphates and of the action of ammonia gas on the cal- 

 cium hydro-orthophosphates are repoi'ted. 



Phosphates and superphosphates in relation to the sulphur industry, L. 

 TiRELLi (Rass. Min., 26 (1907), Nos. 7, pp. 101-103; 8. pp. 118-120; abs. in Chem. 

 Abs., 1 (1907), No. 12, p. 1601). — Laboratory experiments are reported which 

 indicate that it is not practicable to use the sulphur dioxid, formed in the proc- 

 ess of extracting sulphur from minerals by partial combustion, in the manu- 

 facture of superphosphates. 



Fertilizers, A. Stittzer (Diingerlehre. Leipsic, 1907, 16. rev. ed.; rev. in 

 Ztschr. Landw. Versuchsw. Osterr., 10 (1907), No. 6, p. 578). — This is the six- 

 teenth revised edition of this work. 



The use of chemical fertilize/s, Minangoin (Bui. Soc. Hort. Tunisie, 6 

 (1907), Nos. 24, pp. 20-26; 25, pp. 81-87). — This subject is discussed mainly 

 from- the standpoint of Tunisian conditions. 



Results of field experiments with fertilizers in Belgium, Schreiber (BuL 

 A (jr. [Brussels], 23 (1907), No. 7, pp. 445-485). — The results of 3 years' experi- 

 ments with various crops on the typical soils of the different regions of the 

 country are briefly summarized. 



Culture experiments and critical studies on the relative efficiency of 

 nitrate of soda and sulphate of ammonia, H. StJCHXiNG (Jour. Landw., 55 

 2X707—08 3 



