No. of Copies issued, 1,000. 



DEPARTMENT OF AGRICULTURE, 

 NEW SOUTH WALES. 



SCIENCE BULLETIN, No. 21 



THE CAUSE OF BLACK DISEASE AND ITS 

 METHOD OF TRANSMISSION. 



BEING FURTHER STUDIES IN A BRAXY-LIKE 

 DISEASE OF SHEEP. 



SYDNEY DODD, D.V.Sc., F.R.C.V.S., 



Lecturer in Veterinary Pathology and Bacteriology, Veterinary 

 School, The University of Sydney. 



SYDNEY: WILLIAM APPLEGATE GULLICK, GOVERNMENT PRINTER. 



1921. 



33219 -A 



