l>e University of 



KOTXDKI) 1IY JOHN I). ROCKEFELLER. 



t COMPMUTIVE m EXPERIMENTtL STODV OF OiCILLI 

 PRODUCING BED PICMEHT. 



A DISSERTATION 



SUBMITTED TO THE FACULTIES OF THE GRADUATE SCHOOLS OF ARTS, 



LITERATURE, AND SCIENCE, IN CANDIDACY FOR THE 



DEGREE OF DOCTOR OF PHILOSOPHY 



DEPARTMENT OF BACTERIOLOGY 



BY 



MARY HEFFERAN. 



JENA, 



GUSTAV FISCHER. 

 1904. 



