EXPEEIMENT STATION KECOED. 



by a double vaccination. In tliis lot only 4 subsequently developed tbe dis- 

 ease while in 75 unvacccinated controls 26 well-marked cases' of chicken pox 

 occurred in three weeks. Although there seems to be a considerable variation 

 iu the natural susceptibility of fowls to artificial inoculation, birds treated with 

 the vaccines and placed in infected pens escaped the disease while it was 

 possible to infect controls." See also a previous note (E. S. R., 30, p. 785). 



EUEAL ElTGINEERHiTG. 



Irrigation manager and Ms legal problems, F. H. Newell (Jour. Elec- 

 tricity, 33 (1914), No. 5, pp. 95-100, figs. 4)-—-^ discussion is given of the water 

 situation in the Western States, paricular stress being laid upon the economic 

 use of water as a determining factor in its assignment. Illustrations are given 

 of what are pointed out to be the evils occurring under the desert land and 

 Carey acts and of their elimination by the reclamation act. 



aeport on irrigation for the year 1913 {Dcpt. Int. Canada A7in. Rpt., 1914, 

 pt. 7, pp. 119, pis. 12, figs. 50). — This is a report on administrative work, inspec- 

 tions of irrigation projects, stream measurements, special hydrographic surveys, 

 and drainage investigations for the year ended March 31, 1913. A special section 

 by H. O. Brown deals with the rating of current meters. Maps and tabular 

 data accompany the report. 



Irrigating plant for 625 acres, E. R. Feicht (West. Engin., 5 {1914), No. 1, 

 pp. 22-26, figs. 5). — ^This article describes the selection of apparatus and its 

 erection and operation for a small irrigating plant in which first cost as well as 

 satisfactory operating results were conditions of vital importance. 



Irrigation from tube-wells, F. Hughes {Agr. Jour. Egypt, 4 (1914), ^o. 1, 

 pp. 66-70). — Results of examinations of well waters and the soils and crops 

 watered by them in Upper and Lower Egypt indicate that "damage to land 

 or crops by the use of well wa,ter is rare," but " that water having over 1.000 

 parts per million of dissolved matter should be avoided when possible." 



A weir chart, R. J. Broweb (Power, 40 (1914), No. 1, p. 9, fig. 1). — The author 

 explains his idea of a chart applicable to all weirs by which the discharge for 

 any width is readily determined by simple multiplication. 



The transportation of debris by running water, G. K. Gilbert and E. C. 

 Murphy (U. S. Gcol. Survey, Prof. Paper No. 86 (1914), pp. 263, pis. 3, figs. 89; 

 abs. in Jour. Wash. Acad. Sci., 4 (1914), No. 7, pp. 154-158). — Investigations 

 made to determine the laws which control the movement of bed load of debris, 

 and especially to determine how the quantity of load is related to the stream's 

 slope and discharge and to the degree of comminution of the debris, are re- 

 ported. In each experiment a specific load of sand and gravel sorted into 

 grades of uniform size was fed to a stream of specific width and discharge. 



A competent slope <t limiting transportation was found for each combination 

 of discharge, width, and grade of debris. With lower slopes there was no 

 load and increase of slope increased the debris capacity, which varied as 

 (5f — ff)n^ in which S equals the stream's slope and n ranges from 0.93 to 2.37, 

 the values being greater as the discharges are smaller or the debris coarser. 

 For each combination of width, slope, and grade of debris, there was a com- 

 petent discharge, 7c. The capacity varied as (Q—k)", in which Q is the 

 stream's discharge and o ranged from 0.81 to 1.24, the values being greater as 

 the slopes are smaller or the debris coarser. For each combination of width, 

 slope, and discharge, there was a limiting fineness of debris $. The capacity 

 varied with (F — ^)p, in which F is the degree of fineness and p ranged from 

 0,50 to 0.62, the values being greater as slopes and discharges are smaller. 

 For any combination of slope, discharge, and fineness there was a particular 

 ratio of depth to width corresponding to maximum capacity and ranging from 



