ARSTIiACTS OF ITBLirATIOXS OF TIIH IMTFf) STATES DFI'AHTMFNT OF 

 Al.liHTLTniF. ISSFED IN issi). 



P^^RT I. 



BUREAU OF ANIMAL INDUSTRY. 



Hog cholera. D. E. Sal^iox (pi>. 1-107). — This special report 

 treats of the history, nature, and treatment of hog- chokn'a, as deter- 

 mined by the incpiiries and investii>"ations of the Bureau of Animal 

 Industry. In the letter of transmittal it is stated that in the course 

 of the investio-ations two very difl'erent and distinct epizootic dis- 

 eases of SATine were discovered. One of these is called hog cholera. 



Introduction and spread of hog cholera in the United States. — This 

 chapter traces the development of the epizootic swine diseases from 

 tlu' first ()utl)reak recorded in Ohio in 1838 up to 1887, and gives a 

 tabulated statement of the replies from al)out 850 correspondents, 

 showing when the original outbreaks occurred in their localities. It 

 also gives extracts frou.i i)apers by Dr. George Sutton, of Indiana, 

 and Dr. E. ]M. Snow, of Rhode Island, showing the condition of the 

 disease from 18oG to 18G1. 



Tlie inrcst/'f/ations of swine diseases.— X resume of the scientific 

 investigations of hog cholera, beginning with those of Dr. George 

 Sutton, of Aurora, Ind., made from 1850 to 1858, and those of Dr. 

 EdAvin ]M. Snow, of Providence, R. I., published in 1861. The paper 

 contributed by Prof. James Law to the Annual Report of the Depart- 

 ment of Agriculture for 1875 is given in full. There is also a resume 

 of the early investigations of Dr. H. J. Detmers and a brief review 

 of the inA'estigations of Drs. Law. Detmers. and Salmon, published 

 from 1878 to 1880. 



Symptoms and poxt-mortem appearances in hog eholera. — These 

 are stated in detail. The disease is divided into (a) the acute type, 

 (b) the chronic form. The chajiter closes witli the history, autopsy, 

 notes, and bacteriological observations of an outbreak of hog cholera 

 near the city of AA^ashington in 1887. 



The cassation or etiology of hog cholera. — The investigations led 

 to the conclusion that the disease is caused by a bacillus. 



The lj(teilhis of hog eholera. — This l)acillus has been obtained from 

 about four hundred hogs aifected with the disease during the ])ast 

 three vears. It is found in largest numb.-^rs in the spleen. AVhen 



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