1. The occurrence of porphyrins in cultures of C. diphtheria;COULTER C. B.;Jour. Gen. Physiol.,1931
2. The purification and concentration of diphtheria toxin. I. Evaluation of previous methods; description of a new procedure;EATON M. D.;Jour. Bact.,1936
3. The purification and concentration of diphtheria toxin. II. Observations on the nature of the toxin;EATON M. D.;Jour. Bact.,1936
4. The flocculation reaction with purified diphtheria toxin;EATON M. D.;Jour. Immunol.,1936
5. The relation of the bacterial precipitin reaction to th. Ramon flocculation phenomenon;HAZEN E. L.;Jour. Immunol.,1930