582 EXPERIMENT STATION RECORD. [Vol. 39 



equinus was tested in 170 cases and found to be followed by a decrease in the 

 mortality of more than 50 per cent. 



Second report on the investig-ation into joint-ill in foals existing in the 

 Province of Ontario, F. W. Schofield {Toronto, Canada: Govt., 1916, pp. 24, 

 figs. 5). — The investigations here reported, in continuation of those above noted, 

 have led to the following conclusions : 



" The disease joint-ill can be prevented in many cases by the use of a suit- 

 able prophylactic vaccine. The vaccine used in this experiment, while pro- 

 ducing results that are far from ideal, was of definite prophylactic value. The 

 treatment has no untoward effect upon the foal either immediate or delayed. 

 The vaccine should be used in conjunction with the other prophylactic measures 

 in combating this disease. . . . Better results are obtained from the use of 

 vaccines in the treatment of joint-ill than from any other method of treatment. 

 There is much room for improvement as the average mortality is still far in 

 excess of what it should be. . . . 



"A hemolytic streptococcus is apparently very closely related to the disease 

 Joint-ill. Marked pathogenicity for the rabbit is characteristic of the hemolytic 

 streptococcus of joint-ill. In some of the most severe cases, no organisms could 

 be isolated from the joint fluid or blood. Ingestion infection is quite probable 

 since the presence of streptococci has been foimd in the milk of the dam iden- 

 tical with those recovered from the diseased joints of foals." 



A nongas-producing strain of the hog-cholera bacillus isolated from an old 

 laboratory culture, C. TenBroeck {Jour. Expt. Med., 24 {1916), No. S, pp. 

 91S-222). — "In a stock culture of the hog-cholera bacillus, which was passed 

 through a series of rabbits 14 years ago, an organism was found that differs 

 from the original culture in that it fails to form gas from the carbohydrates 

 that are usually attacked by this organism, while acid formation persists. This 

 new strain is agglutinated by an antihog-cholera bacillus serum, and produces 

 in rabbits and mice a disease similar to that caused by the typical cultures. 

 The failure to form gas has persisted over a period of 18 months, and all at- 

 tempts to cause the strain to revert to the original condition have failed." 



The organism resembles in many respects Bacillus typhosus. Attempts to 

 produce a similar change in more recently isolated cultures by animal passages 

 and changes in environment failed. 



RURAL ENGINEERING. 



Seventeenth biennial rei)ort of the state engineer, Colorado, 1913—14, 

 (Bien. Rpt. State Engin. Colo., 17 {1913-14), pts. 1, pp. 261, pi. 1; 2, pp. 350).— 

 This report includes data on the general irrigation situation in Colorado, 

 including financial matters, gives abstracts of reports of the water commis- 

 sioners, reports the results of numerous seepage investigations, and gives the 

 results of measurements of flow made in the Arkansas, Grand, Laramie, Ilio 

 Grande, San Juan, South Platte, Yampa, and White river drainage basins. 



Surface water supply of Pacific drainage basins in Washington and upper 

 Columbia River basin, 1914 {U. S. Geol. Survey, Water-Supply Paper 392 

 {1916), pp. 7-200, pis. 2). — This report, prepared in cooperation with the States 

 of Washington, Montana, and Idaho, contains the results of measurements of 

 flow made on streams in the Puget Sound and the upper Columbia River drain- 

 age basins. 



Profile surveys in Skagit River basin, Washington {U. S. Geol. Survey, 

 Water-Supply Paper 419 {1916), pp. 5-8, pis. 12). — This report, prepared under 

 the direction of W. H. Herron, contains a plan and profile of Skagit River 

 and certain tributaries above Concrete, Wash., made from surveys in 1915. 



