LITERATURE CITED. 



(1) Cook, F. C, Hutchison, R. H., and Scales, F. M. 



1914. Experiments in the destruction of fly larvae in horse manure. U. S. 



Dept. Agr. Bui. 118. 26 p.. 4 pi. 



(2) • 



1915. Further experiments in the destruction of fly larvse in horse manure. 



Dept. Agr. Bui. 245. 22 p.. 1 pi., 1 fig. 



(3) Cook, F. C. 



1916. Boron: Its absorption and distribution in plants and its effect on growth. 



In Jour. Agr. Res., v. 5. no. 19, p. 877-890. 



(4) Folln, Otto, and Macallum, A. B. 



1912. On the determination of ammonia in urine. In Jour. Biol. Chem., 



v. 11, no. 5. p. 523-525. 



(5) Kioxka. 



1909 . Die Gif tigkeit von ' ' Kalkstickstoff ' ' und ' ; Stickstoff kalk. ' ' In Fuhlings 

 Landw. Ztg., Jahgr. 58, Heft 11, p. 397-404. 



(6) Pranke, E. J. 



1913. Cyanamid. Manufacture, Chemistry, and Uses. 112 p. Easton, Pa. 



(7) Wiley, H. W.. Editor. 



1908. Official and provisional methods of analysis, Association of Official 

 Agricultural Chemists. U. S. Dept. Agr. Bur. Chem. Bui. 107, 

 (rev.), 272 p., 25 fig. 



20 



additional copies 



OF THIS PUBLICATION MAY BE PROCURED FROM 



THE SUPERINTENDENT OF DOCUMENTS 



GOVERNMENT PRINTING OFFICE 



WASHINGTON, D. C. 



AT 



5 CENTS PER COPY 

 A 





