Apr. 15, I9IS Availability of the Nitrogen in Kelps 37 



either ammonification or nitrification of readily available organic matter, 

 such as dried blood. 



(9) Similar experiments with Macrocystis showed at first a decrease 

 in the rate of transformation, especially in nitrification. This decrease 

 did not continue and as time passed the ammonification and nitrification 

 became practically normal. 



(10) When using kelp in field practice, it is probable there would be 

 no interference with either ammonification or nitrification from either 

 the kelp or the salts present in it. 



LITERATURE CITED 



(i) American Public Health Association. 



1912. Standard Methods for the Examination of Water and Sewage, ed. af 

 144 p. New York. 



(2) BOUSSINGAULT, . 



1838. Recherches chimiques sur la vegetation, entreprises dans le but d 'ex- 

 aminer si les plantes prennent de 1 'azote a atmosphere. In Ann. 

 Chim. et Phys. , t. 67, p. 5-54. 



(3) Brown, P. E. 



1911. Some bacteriological effects of liming. Iowa Agr. Exp. Sta. Research 



Bui. 2, p. 51-107, illus. 



(4) 



1912. Bacteriological studies of field soils. — I. The effects of lime. Iowa Agr. 



Exp. Sta. Research Bui. 5, p. 19 1-2 10. 



(5) BURD, J. S. 



1915. The economic value of Pacific coast kelps. Cal. Agr. Exp. Sta. Bui. 

 248, p. 183-215, 3 fig. 



(6) Burgess, P. S. 



1913. The aluminum reduction method as applied to the determination of 



nitrates in "alkali" soils. In Univ. Cal. Pub. Agr. Sci., v. i, no. 4, 

 p. 51-62, I fig. 



(7) Lipman, C. B. 



1909. Toxic and antagonistic effects of salts as related to ammonification by 

 Bacillus subtilis. hi Bot. Gaz., v. 48, no. 2, p. 105-125, 5 fig. 



19 10. On physiologically balanced solutions for bacteria (B. subtilis). In 

 Bot. Gaz., V. 49, no. 3, p. 207-215. 



1910. On the lack of antagonism between calcium versus magnesium and also 

 between calcium versus sodium. In Bot. Gaz., v. 49, no. i, p. 41-50, 

 2 fig. 



(8) 

 (9) 



(10)- 



1913. Antagonism between anions as affecting ammonification in soils. In 



Centbl. Bakt. [etc.], Abt. 2, Bd. 36, No. 15/18, p. 382-394, 3 fig. 



(11) and Brown, P. E. 



1909. Notes on methods and culture media. In N. J. Agr. Exp. Sta. 29th 

 Ann. Rpt. [i907]/o8, p. 129-136. 



(12) and Burgess, P. S. 



1914. Antagonism between anions as affecting soil bacteria. In Centbl. Bakt. 



[etc.], Abt. 2, Bd. 41, No. 11/17, p. 430-444, 6 fig. 



