BY 



HOWARD T. KARSNER, M.D. 



PROFESSOR OF PATHOLOGY, WESTERN RESERVE UNIVERSITY, CLEVELAND 



AND 



ENRIQUE E. ECKER, PH.D. 



INSTRUCTOR IN IMMUNOLOGY, WESTERN RESERVE UNIVERSITY, CLEVELAND 



ILLUSTRATED 



. **.(: 



PHILADELPHIA AND LONDON 

 J. B. LIPPINCOTT COMPANY 



