590 EXPERIMENT STATION RECORD. 



An investigation of the pathology of grouse disease, L. Corbett ami G. S. 

 Graham-Smith (Jour. Hyg. [Cambridge], 10 {1910), No. 1, pp. 1-36, pis. 5). — 

 While the causes of death of grouse are various a great majority of birds either 

 picked up dead on the moor or caught by keepers when weak and unable to fly 

 were found to be more or less in the same condition. They were wasted badly, 

 infested with Trichostrongylus pergracilis and often also with Davainea 

 urogalU or Hymenolcpis microps, or with both. 



Disease of canaries, J. A. Gilruth (Neiv Zeal. Dept. Agr. Ann. Rpt., 17 

 (1900), pp. 298-300). — A peculiar disease affecting certain aviaries in the city of 

 Christchurch is reported upon. 



Gnathostomum spinigerum in a domestic cat, S. N. Mitter (Jour. Trap. 

 Vet. Sci., 5 (1910), No. 2, pp. 28-^, 285, pi. 1). — This parasite, previously found 

 in the stomach of several wild animals of the cat tribe, is reported to have been 

 found in the domestic cat for the first time. 



Notes on some parasites in Burma, G. H. Evans and T, Rennie (Jour. Trop. 

 Vet. Sci., 5 (1910), No. 2, pp. 2.'i0-256, figs. 22). — Notes on several common para- 

 sites of elephants are given. 



RURAL ENGINEERING. 



Irrigation in Colorado, C. W. Beach and P. J. Preston (U. S. Dept. Agr., 

 Office Expt. Stas. Bui. 218, pp. -'/8, pi. 1). — This bulletin, which is another of the 

 series of reports on irrigation in the arid States and Territories, contains a 

 large amount of information of practical value to the farmer or prospective 

 settler of Colorado. A general description is given of the State, its transporta- 

 tion facilities, its principal industries, climate, and soil. Tables show the 

 amount of water escaping from the various streams of Colorado each year from 

 the South Platte River at 4 stations, the storage capacities of reservoirs, return 

 seepage, and the areas irrigated on the South Platte River, and the percentage 

 of run-off and rainfall at different stations. Other topics discussed are the 

 development of water power, the rise and progress of irrigation, Cai'ey Act and 

 reclamation service projects, irrigation districts, the beet-sugar industry, and 

 dry fai-ming and irrigation. Estimates of the cost of growing cereals, beets, 

 potatoes, peas, alfalfa and fruit under irrigation in the State are included. 



Materials used in constructing cement and concrete fence posts, H. M. 

 Bainer and 11. B. Bonebright (Colorado Sta. Bui. 161, pp. 3-20, figs. 2). — 

 An abbreviated edition of Bulletin 148 previously noted (E. S. R., 22, p. 191). 



The Iowa silo, J. B. Davidson and M. L. King (loiva Sta. Bui. Ill, pp. 196- 

 266, figs. 50). — This bulletin contains plans and details of construction of sev- 

 eral silos made of hollow clay building blocks, as previously noted (E. S. R., 

 20, p. 687). 



It is claimed that nearly all of the essential merits of a good silo are pos- 

 sessed by this type which is known as the Iowa silo. The walls are strong, 

 rigid, smooth, durable, firepi'oof, impervious to moisture, and resistant to frost. 

 The construction is simple yet convenient and can be made with either indi- 

 vidual or continuous doors. Five different sizes of rectangular blocks have 

 been used. Steel wire, hard black No. 3 (i in. in diameter), has been found to be 

 the most desirable reinforcement, and the working strength has been raised to 

 30,000 lbs. per square inch. The most convenient and advantageous place for 

 the reinforcement is in the mortar joints, where as its thickness is less than 

 that of the joint it does not interfere with the laying of the blocks and it is 

 thoroughly jirotected from rust. 



The experimental silo was washed on the inside with cement and has been 

 entirely satisfactory, indicating that plastering on the inside oi" outside is not 



