1. 1) Dernbyu nd Siwe, Die Anpassung der Diphtherie bai llen an H-und oH-Ionen 1922 biochem Z, 132, S.412
2. 2) Michaelis L., u. Marcora, F., 1912, Die Saeureproduktivitaet des Bacterieum coli Z. f. Immuni tätsf Bd, 14, S. 170.
3. 3) Clak, w. M., 1915' The finalhy drogen ion concentrations of Cultures of Bacillus coli, Jour of Biocham. 22, p.87.
4. 5) F.S. Jones, 1920, Influence of Variations of Media on acid production by streptococci, J. Exp. Med., 32, p, 273.
5. 7) Henderson, L. J., and Webster, H. B., 1907, The Pveservation of Neutrality in Culturemedia with the acid of phosphates J, Med, Res.16, p. 1