Atkins — Bihliography. 431 



Foot, F. J., 1865. — On the occurrence of Gystopteris fragilis, and of Digitalis 



pmyurea on limestone, both near Athlone. Proc. Nat. Hist. Soc, 



Dublin, 4, 2. 

 GiLE, P. L., and Carreeo, J. 0., 1920. — The cause of lime-induced chlorosis 



and availability of iron in the soil. J. Agr. Ees., 20, 33. 

 Geigokiev, p., 1916. — The alkalinity and acidity of acj[ueous soil extracts, 



E.USS. j. agri. exper., 17, 231. 

 Haas, A. E. C, 1920. — Studies on the reaction of plant juice. Soil Sci., 9, 



341-368. 

 Hall, A. D., 1910.— The soil. London. 

 Hardy, F., 1921. — A preliminary investigation into the occurrence of 



different kinds of carbonates in certain soils. J. Agr. Sci., 11, 1. 

 Harris, F. S., 1920. — Soil alkali: its origin, nature, and treatment. Utah. 

 Hartwell, B. L., and Pember, F. R., 1918. — The presence of aluminium as a 



reason for the difference in the effect of so-called acid soil on barley 



and rye. Soil Sci., 6, 259. 

 Harvey, R. B., 1920. ^Hydrogen ion changes in the mosaic disease of 



tobacco plants and their relation to catalase. J. Biol. Chem., 42, 397. 

 Hesselman, H., 1917. — Studier over saltpeterbildningen, etc. Meddel. f. 



Statens Skogsforsoksanstalt. Heffc 13-14, s. 297 and 923. Abstracted 



in J. EcoL, 1919, 7, 210-213. 

 Howard, A., and Howard, G. L. G., 1920. — Some aspects of the indigo 



industry in Bihar. Pt. I. Mem. Dept. Agrie., India, 11, No. 1, 5. 

 HoF, A. G., 1909. — lodo-eosin as a test for free alkali in dried-up plant 



tissues. Biochem. J., 4, 175. 

 Jameson, A. P., and Atkins, W. Pu G., 1921. — On the physiology of the 



silk-worm. Biochem. J., 15, 209. 

 JoFFE, J. S., 1920. — The influence of soil reaction on tlie growth of alfalfa. 



Soil Sci., 10, 301. 

 Kappen, H., 1920. — The form of acidity in soils and its meaning in plant 



physiology. Landw. Versuchsst., 96, 277-307. 

 Keen, B. A., 1921.: — The physical investigation of soil. Science Progress, 



15, 574. 

 KoBER, P. A., 1917. — An improved nephelometer- colorimeter. J. Biol. 



Chem., 29, 155. 

 Lee, W. T., 1907.— U. S. Geol. Survey, Bull. 315, p. 485. 

 LiPMAN, J. G., M'Lean, H, C., and Lint, H. C., 1916.— Sulfur oxidation in 



soils, and its effect on the availability of mineral phosphates. Soil 



Sci., 2, 499. 



