382 EXPERIMENT STATION RECORD. 



quite prevalent in several counties. Two cases of dourine were reported during 

 the year. An outbreak of necrotic dermatitis which occurred among horses in 

 one county was eradicated with considerable difficulty. Swamp fever, which 

 lias been a source of great loss to horse owners in lied River Valley during the 

 year, caused considerable loss in the Turtle Mountain region in the western 

 part of the State. 



Very satisfactory progress is said to have been made toward the eradication 

 of scabies in cattle. Blackleg was reported existing in three counties. Due to 

 an epidemic of anthrax in the southern part of South Dakota, in which some 

 3,000 animals were lost, a quarantine was placed on all territory where the 

 disease existed. Hog cholera was the source of considerable loss in the Red 

 River Valley. 



In the report of the bacteriologist and consulting A-eterinarian, L. Van Es (pp. 

 31-G3), laboratory examinations are presented in tabular form. An account is 

 given of the method in use in the preparation of tuberculin. The preparation of 

 hog cholera serum has been taken up and the author describes the method of 

 preparing this serum and its application in an outbreak of hog cholera in the 

 college herd. 



"After the introduction of infection 74 healthy swine were injected. Of those 

 animals, one died from accidental sepsis. A month after the first serum injec- 

 tion two cases of cholera occurred. This makes a total of three deaths from 

 cholera in 74 injected hogs, and it is our opinion that even this loss could have 

 been prevented l)y using the simultaneous virus-serum injection in the tirst 

 place, instead of depending on the natural exposure of infection. 



"From this observation, and also by carefully considering the time of sick- 

 ness of the check hogs, it would appear that even in the presence of sick hogs 

 in the herd the contagion is not simultaneously introduced in all members of the 

 herd, and when during the very beginning of an outbreak we immunize the 

 herd, it may be questioned if all hogs had an opportunity to have their immunity 

 rendered active during the period when their passive immunity is in force. 

 While they failed to have been th-us exposed during their passive immunity, 

 and happen to make contact with infection afterward, they would not be pro- 

 tected and become sick. This is, in our oiiinion, responsible for our three 

 cholera cases after the first injection. . . . 



" From our experience it would seem advisable to practice the simultaneous 

 virus-serum injection in all herds in which infection had not yet been intro- 

 duced, and also in those where immunization is undertaken at the beginning 

 of the outbreak and in which only a limited number of cases have occurred. 

 Also in herds which are divided in several separate lots, the simultaneous 

 method should be u.sed. Our results in the college herd clearly bear out the 

 claims of the Bureau of Animal Industry, that in this method we have a very 

 efficient means of checking this disease. . . . The author is confident that if 

 such measures be promptly taken, the danger from cholera can be reduced to 

 insignificant proportions." 



Reports of the executive officer, minutes of meetings, and the regulations re- 

 garding the importation of live stock into the State are included. 



Report of traveling pathologist and protozoologist, C. M. Wen yon (Rpt. 

 Wellcome Researeh Lnhs. (iordoii Mem. Col. Khartoum, 3 (WOS), pp. J21-16S, 

 pis. 7, flfif<. IS, map 7).— This is a report of investigations made in connection 

 with the floating laboratory on the Kile and its tributaries. Trypanosomiases in 

 domestic animals, including camels, donkeys, and mules, and their treatment 

 are reportetl upon, and descriptions of the trypanosomes discovered in various 

 animals are presented. Flagellates found in biting flies, Plasmodia, Hemopro- 



