This publication was prepared by the Animal Disease and 
Parasite Research Branch, Agricultural Research Service. 
Page 3, Neg. No. DN-835, Page 4, Neg. No. DN-2677, Page 5, Neg. No. 
BN-2678, Pages 6 and 7, Neg. No. DN-895, Page 8, Neg. No. N-16364, Page 9, 
Neg. Nos. N~-16371, N-16360, Page 10, Neg. Nos. N—-16395, N-16343, Page 11, 
Neg. Nos. N-16339, N-16348. 
Washington, D. C. Issued September 1956 
For sale by the Superintendent of Documents, U. S. Government Printing Office, Washington 25, D.C. - Price 15 cents 
