1P20] RURAL ENGINEERING. 689 



one case paralysis of the hind legs developed. Bouillon cultures of the organism 

 fldniiiilstored intravenously In large doses produced paralysis but failed to pro- 

 duce death. 



" We have observed this form of pneumonia in the tield associated with hog 

 cholera, with lung worm infestation, and following exposure incident to ship- 

 ping or prolonged exposure in dusty yards, and in spite of the fact that we 

 tailed experimentally to transmit the disease in typical form by artificial means, 

 our observations load us to believe that /?. piioryaneus, when once it gains a 

 foothold in the lung tissue, plays an active and important part in destroying 

 hogs that otherwise would recover. Bacterins made from the strains of the 

 organism found active in this outbreak administered frequently in large doses 

 seemed to have some curative value, but immediate and sure results following 

 their administration were not the ride." 



Digestive organs of the chicken, W. T. Johnson (Washington Sta., West. 

 Wash. Sta. Mo. Bui, 8 {1920), No. 4, pp. 58-61, fig. i).— This is a popular 

 account. 



RURAL ENGINEERING. 



Notes on agricultural hydraulics in Cochin China, .1. B6nabenq (Bui. 

 .\gr. Inst. Sci. Saigon [Cochin China], 2 (1920), No. 5, pp. 129-138, figs. 6).— 

 Data on tides in river basins and streams in the rice-growing districts of Cochin 

 China are reported, and it is shown how advantage may be taken of the tides 

 in the management of irrigation and drainage canals for rice irrigation. The 

 tide is apparently sufficient to permit the use of one canal for both irrigation 

 and drainage. 



Report of the drainage demonstrator, .T. Woods (Ann. Rpt. Dept. Agr., 

 New Brunsicick, 1919, pp. 51-54). — Tests of the crushing resistance of clay and 

 cement drain tiles from 3 to 6 in. in diameter showed that for all sizes the 

 I'lay tiles were at least twice as strong. Tests of 15 lots of 3-in. concrete tiles 

 made of sand cement mixtures varying from 3 : 1 to 7 : 1 showed corresponding 

 i-rushing strengths of 754.6 lbs. and 234 lbs. Tests of 4-, 5-, and 6-in. tile made 

 of a 4:1 sand cement mixture showed a decrease in strength as the diameter 

 increased. Dry mixtures gave better average results as regards crushing 

 strength than wet mixtures. This was also true with clay tile. 



Notes on drainage, A. J. Brooks ([Imp. Dept. Agr. West Indies'], Agr. Dept. 

 St. Lucia Leaflet IJf (1918), pp. 8). — The general principles of soil drainage are 

 outlined with particular reference to conditions in St. Lucia. 



Public Roads (U. S. Dept. Agr., Public Roads, 3 (1920), No. 25, pp. 32, figs. 

 11). — This number of this periodical contains the following articles: Bituminous 

 Surface Treated Macadam and Gravel Roads, by J. F. Witt; Winter Road 

 Work in the Dakotas, Minnesota, and Wisconsin a Success, by E. G. Edwards; 

 7,r)G.">.44n Motor Vehicles in United States — Registrations, Licenses, and Reve- 

 nues in the United States during the Calendar Year 1919, by A. P. Anderson; 

 Ft'deral Control of Bridges over our Navigable Streams, by G. B. Pill.sbury ; 

 The "Asphalt Content " of Road Oils, by B. A. Anderton and D. G. Taylor 

 (see Inflow); Galvanized Culverts, by L. G. Carmick (see p. 090); and 

 Federal Aid Allowances: Project Statements Approved in April, 1920. 



The " asphalt content " of road oils, B. A. Anderton and D. G. Tayt.ok 

 (U. S. Dept. Agr., Public Roads, 3 (1920), No. 25, pp. 23-25, fig. 1).— Experi- 

 ments to dotennine the value of the grading of asphaltic road oils, on the basis 

 of the percentage of asphalt contained in them, led to the conclusion that the 

 percentage of asphalt gives no additional information on the suitability of a 

 road oil for a given purpo.se which is not adetjuately shown by the results of 

 other tests, better understood and at the present time well standardized. 



