790 EXPEKIMENT STATION BECOKD. 



with the result that the virulence was considerably increased for rats. 

 A number of cultures of increased virulence were then distributed in 

 ditlerent cities, and experiments conducted in the destruction of rats. 

 The results indicate that this organism furnishes an effective means 

 for ridding cities of rats, but in no case can be relied upon to utterly 

 exterminate the rats in any locality. 



The prophylaxis of paludism {Rev. Sci. IParisI, 4- ser., U {1900), No. 7, pp. 

 208-211). — Brief notes on the biology of mosquito larvse and a discussion of the 

 methods for their destruction. 



The propagation of the filarise of the blood exclusively by means of the 

 puncture of peculiar mosquitoes, B. Grassi and G. Noe {British Med. Jour., 1900, 

 No. 2079, pp. 1S06, 1307). — Experiments by the authors demonstrated that the larvfe 

 of tilaria are found in Anophelen cktviger. The larvse of filaria sucked up with blood 

 by the mosquitoes migrate into the Malphigian tubes, where they continue their 

 development. At the completion of the larval development the larva? pass into the 

 body cavity, move forward toward the head, and collect in the prolongation of the 

 body cavity within the labium. Experiments on dogs showed that when Anopheles 

 bites these animals the larvte pass out of the labium and are thus inoculated into the 

 bitten animal. 



The communicable diseases of domestic animals that materially affect the 

 live-stock industry, W. C. Rayen {Jour. Comp. Med. and Vet. Arch., 21 {1900), No. 

 3, pp. 134-139). — Notes on tuberculosis, Texas fever, blackleg, and hog cholera. 



The significance of atmospheric infection in the more important animal 

 diseases and means for controlling the danger of such infection, K. Kasselmann 

 {Zf.^chr. Tiermed., 4 {1900), Nj.^. 2-3, pp. 124-142; 4, pp. 260-282; 5, pp. 321-343).— 

 An elaborate critical discussion of the literature of the subject with special reference 

 to tuberculosis, glanders, anthrax, blackleg, rinderpest, sheep pox, contagious pleuro- 

 pneumonia of cattle, influenza, swine plague, pneumonia of horses, and foot-and- 

 mouth disease. In the general discussion of methods for preventing infection of 

 domesticated animals through the air, the author classifies such measures into 3 groups: 

 Those which tend to prevent the inhalation of micro-organisms in the air, those 

 which prevent the entrance of micro-organisms into the atmosphere, and those 

 which are concerned with destroying micro-organisms in the air. A bibliography of 

 80 titles is appended. 



Colloidal silver, M. Klimmer {Ztschr. Tiermed., 4 {1900), No. 4, PP- 289-300).— 

 From cxiieriments with this substance in veterinary practice, the author concludes 

 that colloidal silver is best administered with the addition of albumen, gelatin, or 

 gum arable, in order to protect it from the action of the salts which are found in 

 animal fluids. Colloidal silver injected hypodermically in a physiological salt solu- 

 tion containing albumen is almost completely absorbed. When injected intra- 

 venously or hypodermically, it is for the most part excreted in feces. Colloidal silver 

 injected intravenously produces an elevation of temperature in healthy and diseased 

 horses. In the intestines it has only a very slight antiseptic effect. 



The value of iodin-protein compounds in veterinary practice, Roder {Arch. 

 Wiss. XI. PraJct. Thierh., 26 {1900), No. 4-5, iJp. 325-33.5) .—The author experimented 

 with several forms of iodin-protein compounds in the treatment of diseases of 

 animals. The results indicate that iodin has the same therapeutic effect when 

 given in combination with protein, but does not have the harmful secondary effects 

 which are noted when it is given alone. The author recommends iodin combined 

 with protein for the treatment of actinomycosis. 



Gangrenous sloughing of the tail of domestic animals, Ellinger {Berlin. 

 Tierarzll. Wchnschr., 1900, No. 43, jyp- -50.5-507).— Various names have been given to 



