VETERINAEY MEDICINE. 287 



The repression of tuberculosis in dairy herds, J. D. Stewart (Agr. Gaz. 

 N. S. Wales, 23 (1912), No. 3, pp. 223-233) .—This is a critical review of the 

 methods proposed and in vogue for repressing tuberculosis in dairy herds. It 

 includes the metbods for diagnosis and immunization, Bang's method, the ques- 

 tion of employing tubercular help in dairies, and the feeding of pasteurized 

 milk in rearing young animals. 



The action of arsenical dips in protecting cattle from infestation with 

 ticks, H. W. Graybill {U. 8. Dept. Agr., Bur. Anim. Indus. Bui. 161, pp. 21). — 

 This bulletin reports the results of work with dips, undertaken mainly for the 

 purpose of determining to what extent and how long an arsenical dip protects 

 cattle from infestation with ticks after dipping. 



In 3 experimeuts conducted with cattle, it was found that infestation was 

 prevented for 2 days and that there was no protection when the exposure to 

 infestation occurred 5 days or longer after dipping. Further experiments to 

 ascertain if the protection extends beyond 2 days are in progress and will be 

 reported later. 



The author found that smearing the scutum and mouth parts of engorged 

 females with oils and viscous substances had no influence on the mortality or 

 oviposition, or on the percentage of eggs hatching. 



Arsenica] poisoning which occurred among the animals in one experiment was 

 apparently caused by undissolved arsenic in the dip, indicating that undis- 

 solved arsenic in a dip is highly dangerous. " It is shown conclusively that the 

 protective action of arsenic is dependent on its toxic action, and not on a 

 repellent action. As a result of incidental observations made on engorged 

 female ticks from animals suffering from Texas fever, it was found that the 

 mortality of such ticks may be very high, as much as 95 per cent. The cause 

 for this is not known. It may be nutritional in character, due to the changed 

 or impoverished condition of the blood absorbed, or it may be due to the para- 

 sitism of Piroplasma bigeminum. . . . Observations made for the purpose of 

 determining whether there was any relationship between the degree of infest^v- 

 tion and the time elapsing between the last dipping and the infestation, and 

 also on the mortality of engorged females from dipped animals infested subse- 

 quently to dipping, as compared with that of ticks from undipped animals, were 

 inconclusive. Oviposition and viability of the eggs of these ticks appeared to be 

 unaffected." 



Epidemic interstitial pulmonary emphysema in milch cows, Knese (Berlin. 

 Tierdrztl. Wchnschr., 28 {1912), No. J,S, pp. 80^, 805; ahs. in Vet. Rec, 25 

 (1912), No. 1212, pp. 301, 308). — The author reports on the occurrence of an 

 epidemically appearing disease of cows observed in Norden, the cause of which 

 has not been determined. He regards the affection as a peracute, interstitial, 

 pulmonary emphysema combined with catarrhal pneumonia. 



Hookworm disease in sheep and other animals (Agr. News [Barbados], 

 12 (1913), No. 288, p. 149). — CEsophagostomum venulosum is thought to be the 

 cause of " la gomme " in Dominica, and 0. columbianum to cause nodular 

 disease in St. Lucia and St. Vincent. 



Fixed hog cholera virus, J. Reichel (Jour. Infect. Diseases, 12 (1913), 

 No. 1, pp. 106-110; Amer. Vet. Rev., J,2 (1913), No. 5, pp. 559-563, fig. i).— For 

 preparing fixed hog cholera virus, or one which had attained the highest degree 

 of virulence possible, 19 strains of seed virus obtained from outbreaks in 8 

 States were given in 2 to 5 cc. doses subcutaneously to 1,964 susceptible hogs. 

 Of those 1,720, or 93.7 per cent, became diseased in less than 40 days. 

 1506°— No. 3—13 7 



