HYDRUUEN-ION CONCENTRATION 169 



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 Foster, J. W.: Chemical Activities of Fungi, Academic Press, Inc., New York, 1949. 

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 Haldane, J. B. S.r Enzymes, Longmans, Roberts and Green, London, 1930. 

 Henry, B. W., and A. L. Andersen: Sporulation by Piricularia oryzae, Phytopathol- 

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 Johnson, H. W.: Some relationships between hydrogen ion, hydroxyl ion and salt 



concentration and the growth of seven soil molds, loiva State Coll. Ayr. Mech, 

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 KoLTHOFF, I. M., and C. Rosenblum: Acid-base Indicators, The Macmillan Com- 

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 *LiLLY, V. G., and 11. L. Barxett: The influence of pH and certain growth factors 



on mycelial growth and perithecial formation by Sordaria fimicola, Am. Jour. 



Botany 34: 131-138, 1947. 

 Lilly, V G., and L. LI. Leonian: The interrelationship of iron and certain accessory 



factors in the growth of Rhizobium trifolii strain 205, Jour. Bad. 50: 383-395, 



1945. 

 Lindeberg, G.: Ueber die Physiologie Ligninabbauender Bodenhymenomyzeten, 



Symbolae Botan. Upsalienses 8(2): 1-183, 1944. 

 LiNGANE, J. J. : Saturated potassium hydrogen tartrate solutions as a pH standard. 



Anal. Chem. 19: 810-811, 1947. 

 LuNDEGARDH, H. : Dcr Einfluss der WasserstofRonenkonzentration in Gegenwart 



von Salzen auf das Wachstum von Gibherella Saubinetti, Biochem. Zeit. 146: 



564-572, 1924. 

 McCalla, T. M.: Cation adsorption by bacteria. Jour. Bad. 40: 23-32, 1940. 

 Mathur, R. S., II. L. Barnett, and V. G. Lilly: Sporulation of Colletotrichum 



Imdemuthianum in cultvire. Phytopathology 40: 104-114, 1950. 

 Meacham, M. R.: Note upon the hydrogen ion concentration necessary to inhibit 



the growth of four wood-destroying fungi, Science 48: 499-500, 1918. 

 Pehrson, S. O.: Studies on the growth physiology of Phacidium infestans Karst., 



Physiologia Plantar um 1: 38-56, 1948. 

 Pritham, G. H., and A. K. Anderson: The carbon metabolism of Fusarium lyco- 



persici on glucose, Jour. Agr. Research 55 : 937-949, 1937. 

 Rahn, O., and G. L. Richardson: Oxygen demand and oxygen supply. Jour. Bad. 



41: 225-249, 1941. 

 RoBBixs, W. J.: Isoelectric points for the mycelium of fungi, Jour. Gen. Physiol. 



6: 259-271, 1924. 

 *RoBBiNS, W. J., and M. B. Schmitt: Factor Z2 and gametic reproduction by Phy- 



comyces, Am. Jour. Botany 32 : 320-326, 1945. 

 Ryan, J. F., G. W. Beadle, and E. L. Tatum: The tube method of measuring the 



growth rate of Neurospora, Am. Jour. Botany 30 : 784-799, 1943. 

 *Scott, I. T.: The influence of hydrogen-ion concentration on the growth of Fusarium 



lycopersici and on tomato wilt, Missouri Coll. Agr. Research Bull. 64, 1924. 

 Snell, F. D., and C. T. Snell: Colorimetric INIethods of Analysis, 3d ed., D. Van 



Nostrand Company, Inc., New York, 1948. 

 Starkey, R. L., and S. A. Waksman: Fuiigi tolerant to extreme acidity and high 



concentrations of copper sulfate, Jour. Bud. 4C : 509-519, 1943. 

 Tamiya, H.: Studi^n liber die Stoffwechseiphysiologie von Aspergillus oryzae. II. 



Acta Phyiochim. {Japan) 4: 77-213, 1928. 

 Umbreit, W. W., R. IL Burris, and -J. F. Staufj^es? Manomptrjc Techniques and 



