882 EXPERIMENT STATION RECORD. 



The report considers the history of the appearances and spread of the disease, 

 its pathogenesis, modes of infection, symptomatology, course and prognosis, 

 therapy, immunization, and preventive inoculation and disinfection. A draft 

 of regulations for its prevention is appended. In investigating its appearance 

 and spread among horses in Japan, it was found that very few cases developed 

 in the stable but on ])asture it easily spread with astounding rapidity, a great 

 majority or the entire herd succumbing to it. The experiments conducted led 

 to the conclusion that tlie entrance of the virus into a healthy individual 

 through its alimentary canal can actually take place but that if it takes place 

 in nature it must be a very slow and liuilte<^l process. They demonstrate that 

 the disease can be transmitted without intercour.se between healthy and sick 

 horses when the free access of insects is not jirevented. 



In pasturing experiments the disease was spread in both May and June when 

 horseflies {Chrysopus japonicus and Hcentatopota tristis) appear and in July 

 and August when several species of Tabanus occur, thus leading the committee 

 to conclude that horseflies are the real transmitters of infectious anemia among 

 horses in Japan. It is known that horses become immune to the disease but the 

 results of preventive inoculation experiments thus far have been negative. 



The use of artificial sera for strangles in horses, Sustmann {Berlin. Tier- 

 drztl. WcMischr., 30 (1914), No. 29, pp. 516, 517). — Good results were obtained 

 in severe and atypical cases by giving subcutaneous injections of artificial sera 

 composed of the following ingredients: (1) (Hayem's) sodium chlorid 5 gm., 

 sodium sulphate 10 gm., boiled water to make 1,000 cc. ; (2) sodium chlorid 2i 

 gm., sodium sulphate 5 gm., sodium nucleinate 2 gm., and boiled water to make 

 500 cc. Both of these solutions, which are administered at blood heat, should 

 be tried for other diseases. 



The pathology of pseudotuberculosis of rodents caused by Bacillus pseudo- 

 tuberculosis rodentium, T. Messerschmidt and Keller {Ztschr. Hyg. u. Infek- 

 tionsJcrank., 77 (1914), No. 2, pp. 289-303) .—This work deals briefly with the 

 morphological, cultural, and serological characteristics of B. pseudotuberculosis 

 rodentium, its resistance to heat and disinfectants, pathogenicity for experi- 

 mental ai^imals, etc. Histologic studies are also reported upon. 



RURAL ENGINEERING. 



Irrigation development in Montana, S. T. Harding (Montana Sta. Bui. 103 

 (1915), pp. 211-336, figs. 9). — This bulletin was prepared under a cooperative 

 agreement between this Office and the Montana Station. It does not deal with 

 the practice of irrigation, but gives data as to the present and prospective irri- 

 gation development of the State based on a study of the available water supply 

 and of the lands so situated as to be capable of irrigation, which are described 

 in eight divisions according to climatic, physical, and agricultural conditions. 

 Considerable statistical and legal data with reference to agriculture and irriga- 

 tion in the State are given and irrigation projects in the different divisions are 

 described in detail. 



It is stated that there is now leaving Montana an average of from 30,000,000 

 to 35,000,000 acre-feet of water per year. The direct flow without storage would 

 supply, if fully used, about one-third this amount. 



Drilling 30-inch wells for irrigation, F. W. Park (Irrig. Age. 30 (1914), 

 No. 1, pp. 393-395, 415, figs. 5). — It is the main purpose of this article to explain 

 how these large diameter wells are sunk to receive deep-well pumps. 



Solving the silt problem, L. C. Hill (Engin. Ree.. 10 (1914), No. 23, pp. 609, 

 610). — The author suggests for muddy streams in the Southwefit the cr.r.stmo- 

 tion of reservoirs at the head of the irrigation canal systems to prevent the 



