346 EFFECT OF CHEMICAL AGENTS [Ch. XI 



Johnson, S. W. '68. How Crops grow. 394 pp. New York. 



Jordan, E. O. and Richards, E. '91. Investigations upon Nitrification 



and the Nitrifying Organism. From Report, Mass. State Board of 



Health, Water Supply, and Sewage. Part 11. pp. 865-881. [Dated 



1890.] 

 Kejimerich, E. '69. Untersuchungen tiber die physiologische Wirkung der 



Fleisohbriihe, des Fleischextracts und der Kalisalze des Fleisches. 



Arch. f. d. ges. Physiol. II, 40-93. 

 K(jCH, A. and Kossowitsch, P. '93. Ueber die Assimilation von freiem 



Stiokstoff durch Algen. Bot. Ztg. LI, 321-325. Nov. 1, 1893. 

 Kossowitsch, P. '94. Untersuchungen Uber die Frage, ob die Algen freien 



Stiokstofi fixiren. Bot. Ztg. LII, 97-116. 16 May, 1894. 

 Keukenberg, C. F. W. '80. (See Chapter II, Literature.) 



'78. Mangan ohne naohweisbare Mengen von Eisen in der concretionen 



aus dem Bojanus'sohen Organe im Pinna squamosa Gm. Unters. 



Physiol. Inst. Univ. Heidelberg. IL 287-289. 

 KuNKEL, A. J. '91. Zur Frage der Eisenresorption. Arch. f. d. ges> 



Physiol. L, 1-24. 25 June, 1891. 

 '95. Blutbildung aus anorganischen Eisen. Arch. f. d. ges. Physiol. 



LXI, 595-606. 25 Sept. 1895. 

 Laurent, E. '88. Sur la formation d'amidon dans les plantes. Bruxelles, 



1885. 

 Lawes, J. B. and Gilbert, J. H. '53. On the Composition of Foods^ 



in Relation to Respiration and the Feeding of Animals. Rept. 22d 



Meet. British Ass. Adv. Soi. for 1852, 323-353. 

 Lawes, J. B., Gilbert, J. H. and Pugh, E. '61. On the Sources of the 



Nitrogen of Vegetation, with Special Reference to the Question whether 



Plants assimilate Free or Uncombined Nitrogen. Philos. Trans. Roy. 



Soo. London. CLI, 431-577. 

 Liebscher '93. Beitrag zur Stiokstofffrage. Jour. f. Landwirtschaft. 



XLI. [not seen.] 

 LoEB, J. '92. (See Chapter X, Literature.) 

 Loew, O. '91. Die chemische Verhaltnisse des Bakterienlebens. CentralbL 



f. Bakteriol. IX, 659-663. 

 '91". Ueber die physiologischen Functionen der Phosphorsaure. Biol. 



CentralbL XI, 269-281. 1 June, 1891. 

 '96. The Energy of the Living Substance. 116 pp. London. 1896. 

 LoEW, O. and Bokorny, T. '87. Chemisch-physiologische Studien uber 



Algen. Jour. f. prakt. Chem. XXXVI, 272-291. 

 LiJPKE, R. '89. Ueber die Bedeutung des Kaliums in der Pflanze. Landw.. 



Jahrb. XVII, 887-913. 

 Macallum, a. B. '91. On the Demonstration of the Presence of Iron in 



Chromatin by Micro-chemical Methods (Abstract). Proc. Roy. Soc. 



XLIX, 488-489. July 10, 1891. 

 '92. Idem. Proc. Roy. Soc. XL, 277-286. Jan. 20, 1892. 

 '94. On the Absorption of Iron in the Animal Body. Jour, of Physiol.. 



XVI, 268-297. 17 April, 1894. 



