1917] EURAL ENGINEEEING. 885 



*' Of birds artificially infected with the disease and tested in the laboratory, 

 in round numbers 90 per cent gave positive reactions ; and in 6 per cent the 

 test failed to indicate a reaction when lesions were present. In 3 per cent no 

 reaction occurred and no lesions were present. In a field test on 231 birds 

 made simultaneously Avith the agglutination test, the intradermal test at 38 

 hours failed to detect one case reported positive to the other test. In a second 

 flock of 50 birds in which the two tests were compared, the intradermal test 

 when read at 46 hours failed to indicate one case that was detected by the 

 agglutination test. Anothei- group of about 100 birds tested under unfavorable 

 conditions gave less satisfactory results. . . . Autopsy does not furnish an 

 absolute standard for comparing the accuracy of tests. Seventy-two per cent 

 only of naturally infected birds that had reacted to one or both tests were 

 found on autopsy to be unmistakably infected. . . . 



" The intradermal test has already shown sufficient promise to warrant 

 further extensive trials in the field in comparison with the agglutination test." 



Poultry farm disinfection, J, B. Paige {Massachusetts Sta. Circ. 66 (1916), 

 pp. 4). — This circular describes briefly some simple methods of disinfection 

 applicable to the poultry farm. 



American records of Dioctophyme renale, M. C. Hall (Jour. Amer. Vet. 

 Med. Assoc, 50 (1916), No. 3, pp. 370, 871).— The author calls attention to two 

 records of the occurrence of the giant kidney worm additional to those compiled 

 by Riley (E. S. R., 36, p. 86). 



RURAL ENGINEERING. 



Thirteenth biennual report of the state engineer of Wyoming, 1915—16, 

 J. B. True (Bien. Rpt. State Engin. Wyo., 13 (1915-16), pp. 379, pis. 11).— A 

 report for the years 1915 and 1916. 



Second report on the water powers of Alabama, B. M. Hall and M. R. 

 Hall (Oeol. Survey Ala. Bui. 17 (1916), pp. U8, pis. 19, figs. 4). — This report 

 gives the results of measurements of flow made on the important streams of 

 Alabama. 



Surface water supply of the lower Mississippi River basin, 1915 (U. S. 

 Geol. Survey, Water-Supply Paper 407 (1917), pp. 5-43-\-XXXIII, pis. 2).— 

 This report, prepared in cooperation with the States of Colorado and New 

 Mexico, presents the results of measurements of flow made on the Arkansas and 

 Red River basins during 1915. A section on stream-gaging stations and pub- 

 lications relating to water resources is appended. 



Ground water for irrigation in the Morgan Hill area, California, W. O. 

 Clakk (U. S. Geol. Survey, Water-Supply Paper 40O-E (1917), pp. 61-108, pis. 

 3, figs. 5). — This report deals with the geology and ground water of an area 

 of about 15,730 acres in the Santa Clara Valley, Cal. Precipitation and stream 

 flow data affecting the area are also included. 



" The soils of the region range from gravelly clay loam to a rather heavy 

 sandy loam and vary widely in fertility. In the central part of the area, about 

 Morgan Hill, they consist predominantly of coarse, angular gravel and on the 

 whole are the least fertile in the area, though even in this locality they show 

 rather wide variations in character and fertility, some of them being very open 

 and porous and others comparatively tight and impervious." 



•' In the Morgan Hill area the ground water occurs in the valley alluvium. 

 Over most of the valley area the water table . . . lies at a depth of about 20 

 to 80 ft. below the surface of the ground during the low-water season and about 

 15 to 50 ft. during the high-water season. . . . Although the development of 

 the ground water within the proposed irrigation district has been very slight, so 

 far as it goes it seems to show satisfactory results, and apparently wells in this 



