Atkins — Hydrogen Ion Concentration of the Soil. 209 



Atkins, W. R. G., 1922, 1. — Some factors affecting the liydrogen ion concen- 

 tration of the soil and its relation to plant distribution. Sci. Proc, 

 Royal Dublin Soc, 16 (N.S.), 369--434; and Notes, Bot. School, Trinity 

 Coll., Dub., 3, No. 3, 133-198. 



Atkins, W. R. G., 1922, 2. — The hydrogen ion concentration of natural waters 

 and of some etching reagents in I'elatiou to action on metals. Trans. 

 Faraday Soc. Meeting, Nov. 20th. 



BoRESCH, K., 1920. — Ein neuer die Oyanophyceenfarbe bestimmen der Faktor. 

 Ber. deut. bot. Ges., 38, 286--7. 



CoNNEK, S. D., 1921. — Liming in its relation to injurious inorganic compounds 

 in the soil. Jour. Amer. Soc. Agron., 13, No. 3, 113--124. 



DuGGAR, B. M., 1920. — The use of "insoluble" salts in balanced solutions for 

 seed plants. Ann. Missouri Bot. Gard., 7, 307-327. 



Elst, V. D., 1922.— Quoted from 0. Arrhenius (1922, 1). 



Frosteeus, B., 1914. — Yersuch einer einteilung der Boden des Finnlaudischen 

 Moranengebietes. Femiia. Bull, de la Soc. de geog. de Finlande, 33, 

 1-124. 



GiLE, P. L., and Carrero, J. 0., 1916, 1. — Immobility of iron in the plant. 

 J. Agrie. Res., 7, 83-87. 



GiLE, P. L., and Carrero, J. 0., 1916, 2. — Assimilation of iron from certain 

 nutrient solutions. J. Agric. Res., 7, 503-528. 



GiLE, P. L., and Carrero, J. 0., 1920. — Cause of lime-induced chlorosis and 

 availability of iron in the soil. J. Agric. Res., 20, 1, 33-62. 



Haas, A. R., 1916. — The acidity of plant cells as shown by natural indicators. 

 J. Biol. Chem., 27, 233. 



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



Jones, L. H., and Shive, J. W., 1921. — Effect of ammonium sulphate upon 

 plants in nutrient solutions supplied with ferric phosphate and ferrous 

 sulphate as sources of iron. J. Agric. Res., 21, 701-28. 



Kraemer, H., 1906, 1909. — Colour of flowers as modified bv additions to the 

 soil. Science, 23, 699, and 29, 828. 



Lipman, C. B., 1921. — A contribution to our knowledge of soil relationships 

 with Citrus chlorosis. Phytopathology, 11, 3O1-305. 



Macallum, a. B., 1897. — A new method of distinguishing organic and inorganic 

 compounds of iron. J. Physiol., 22, 92. 



Maquenne, L., and Cerighelli, R., 1921. — Sur la distribution du fer dans les 

 vegetaux. Comptes-Rendus, Paris, 173, 273-278. 



McBain, J. W., 1901. — Oxidation of ferrous solutions by free oxygen. J. Phys. 

 Chem., 5, 623. 



McCall, a. G., and Haag, J. R., 1921. — The relation of the hydrogen ion 

 content of nutrient solutions to growth and chlorosis of wheat plants. 

 Soil. Sci., 12, 69-77. 



SCIENT. PROC, B.D.S., VOL. XVII, NO. 23. 2 P 



