182 EXPERIMENT STATION EECORD. 



conditions before reaching the laboratory. The material was placed in a 

 Petri dish, together with a small quantity of moist cotton, water being occa- 

 sionally added. Examinations made at different times revealed a number of 

 active larvae until August 18, at which time but one or two were alive, and 

 these could not have lived much longer. It is considered probable, however, 

 that the larvae would have lived much longer under natural conditions. A calf 

 is said to have become infested when placed in a field that had been free from 

 animals from November 26, 1906, to September 23, 1907. 



Medicinal treatment proved very unsatisfactory and is considered of little 

 value. This was not due to the fact that the worms could not be destroyed 

 but rather to the difficulty in getting drugs directly to the fourth stomach. The 

 author drenched animals with colored solutions, but was unable to Hud more 

 than traces of the coloring matter in the fourth stomach. 



The details of the experiments in which coal-tar creosote, carbon bisulphid, 

 and other anthelmintics were used are presented in tabular form. 



During 1904-5 the administration of 1 per cent of coal-tar creosote appeared 

 satisfactory, but subsequent trials have led the author to believe that the im- 

 provement noted at that time must have been due to other causes, as all these 

 materials were evidently useless. Most of the animals died and the post- 

 mortem examinations showed that the parasites were not affected by the 

 treatment. 



In view of these experiments it appears that the checking of the disease 

 must be accomplished by preventive measures, and such measures, including 

 the burning, abandoning, and cultivation of pastures are briefly considered. 

 Pastures which can not be cultivated can be freed by burning and abandoning 

 for 18 mouths if washing of material from infested land is prevented. 



The fight ag'ainst sheep pox in the high plateaus of Alg-eria and the 

 Sahara, A. Boquet {Hyg. Yiande et Lait, 2 (WOS), No. 7, pp. 297-317).— This 

 is an account of sheep pox which is said to be enzootic throughout Algeria, 

 particularly in the high central plateau and on the Saharan border. It occurs in 

 acute and subacute form, the acute form usually resulting in a mortality of 

 from 6 to 8 per cent, but in some cases in a mortality of 40 per cent. The 

 subacute form is benign. 



Is the Bacillus suipestifer the cause of hog cholera or not? HtJBENER 

 iCentbl. Bald, [etc.], 1. Aht., Orig., J,7 (1908), No. 5, pp. 586-590) .—The author 

 concludes that hog cholera is caused by an organism that is more resistant to 

 antiseptics than is B. suipestifer. 



Prevention of hog cholera, M. Jacob {Tennessee Sta. Bui. 85, pp. 27-31; 

 Rpt. Coop, and Ext. Work Agr. Middle Tenn. 1907-8, pp. S-'/-8S).— In an in- 

 troductory note the director of the station states that the results of tests of 

 inoculation with serum have proved sufficiently satisfactory to warrant the 

 station in giving this matter an important place in the cooperation and exten- 

 sion work in Middle Tennessee. 



A brief account is given of the methods in use. The hog-cholera work was 

 started at the station farm August 22, 1008. In order to test the efficiency 

 of the serum produced, 2 pigs were each inoculated with 2 cc. virulent blood 

 and one of the two simultaneously with 30 cc. of the serum. The check pig 

 died, while the one simultaneously treated with serum suffered no ill effects 

 whatever. In the middle of November a herd near Nashville in which hog 

 cholera had broken out was immunized by the serum-simultaneous method. 

 Whereas 64 animals had died during the 6 weeks previous to the treatment, up 

 to December 31 but 16 additional hogs had died. No deaths had occurred during 

 the last 2 weeks of December, indicating that those that did die after being 

 immunized had probably been infected at the time the inoculation was made. 



