Occurrence of Manganese in Wheat 355 



(5) I do not wish to draw conclusions from my facts relative to the 

 essential character of manganese as a mineral constituent of plants, 

 though these facts seem to support this view for wheat and possibly for 

 emmer, rye, oats, etc. It seems improbable that a nonessential con- 

 stituent would occur in all samples and in essentially the same quantity 

 under such a variety of conditions. 



LITERATURE CITED 

 (i) Bertrand, Gabriel. 



1912. Sur le role des infiniment petits chimiques en agriculture. In Ann. Inst. 

 Pasteur, t. 26, no. 11, p. 852-867, i fig. 



(2) BrenchlEy, Winifred E. 



1910. The influence of copper sulphate and manganese sulphate upon the growth 

 of barley. In Ann. Bot., v. 24, no. 95, p. 571-583, 4 fig., pi. 47. See 

 also [Rothamsted Exp. Sta., Harpenden, Eng.] Rothamsted Mem. Agr. 

 Sci., V. 8, 1902-1912. 1914. 



(3) Guthrie, F. B., and Cohen, L. 



1910. Note on the occurrence of manganese in soil, and its effect on grass. In 

 Agr. Gaz. New South Wales, v. 21, pt. 3, p. 219-222. 



(4) JoST, Ludwig. 



1907. Lectures on Plant Physiology... Translated by R. J. Harvey Gibson. 564 

 p., illus. Oxford. 



(5) KELLEy, w. p. 



[1908?] The influence of manganese on the growth of pineapples. Hawaii Agr. 

 Exp. Sta. Press Bui. 23, 14 p. 



(6) 



1914. The fimction of manganese in plants, hi Bot. Gaz., v. 57, no. 3, p. 213- 

 227. Literature cited, p. 226-227. 



(7) VOELCKER, J. A. 



1903. Pot-culture experiments, 1902. In Jour. Roy. Agr. Soc. England, v. 64, 

 p. 348-364, fig. 5-13. 



