PTOMAINES, LEUCOMAINES, 



BACTERIAL PROTEIDS: 



THE CHEMICAL FACTORS IN THE CAUSATION OK DISEASE. 



^ BY 

 VICTOR C. VAUGHAN, Ph.D., M.D., 



PEOPKSSOB OF IIYGIENB AND PlIYSiaCOGIt'AL CHEMI8TEY IN THE UNIVEBSITY OF MICHIGAN, 

 AND DIRECTOR OF THE HYQIENIC LABORATORY ; 



AN& 



FREDERICK G. NOVY, Sc.D., M.D., 



ASSISFANT PROFESSOR OP HYGIBNF. AND PHYSIOLOGICAL CaBMISTEY IN THE UNIVERSITY 

 OF MICHIGAN. 



SECOND EDITION, REVISED AND ENLARGED. 



PHILADELPHIA: 



LEA BROTHERS & CO., 

 1891. 



