/ 



190 EXPERIMENT STATION EECORD. 



ing the wooden-hooped, Wisconsin, and Gurler silos are said to have been used 

 with variable success. 



As regards the concrete silo it is stated that the percentage of failures is 

 less with this type than with most others, and that the experience in that 

 State has demonstrated that they are a success. When brick can be obtained 

 cheaply a good silo can be built at a moderate cost. The vitrified hollow tile 

 silo is considered the best silo made, embodying every factor which goes to 

 make a perfect silo, but its cost is said to be almost prohibitive to all but the 

 well-to-do or wealthy farmer. Metal silos are not wholly satisfactory in 

 Colorado owing to freezing. The pit silo, for the money Invested, is said to 

 be by far the best silo used and the bank and trench silos, both of which are 

 closely related to the pit silo, are said to be convenient and give good results 

 where they may be used. 



Building instructions for concrete silos, P. V. Maeis {Colorado Sta. Bui. 

 200 {1914), pp. 32-49, figs. 12). — This report, prepared in cooperation with the 

 Dairy Division of this Department, contains instructions for the building of the 

 monolithic concrete silo, including illustrations, working plans, and bills of 

 material. 



Report on construction of pit silos at the Plains substation, J. W. Adams 

 {Colorado Sta. Bui. 200 {1914), pp. 49-55, figs. ^).— The details of construction 

 of two pit silos, each 10 ft. in diameter and having depths of 23 and 28 ft, 

 are reported. To insure durability and efBciency a concrete ring was placed at 

 the top of the ground in each case. These silos are said to have proved satis- 

 factory in every way and it is concluded that where the ground formation is 

 suitable and there is no danger from seepage the pit -silo is perfectly practical 

 and is within the reach of many who can not afford a high silo. 



Pneumatic water supply systems, H. C. Ramsoweb {Ohio Farmer, 134 

 {1914), No. 13, pp. 1, 18, figs. 7). — Working data and practical information 

 are given regarding the installation and operation of pneumatic and hydro- 

 pueuuiatic water supply systems for farm homes. 



The hygiene of rural schools, T. Clark (Pm6. Health Rpts. [U. S.], 29 

 {1914), No. 37, pp. 2364-2367, pi. 1).— The results of inspections of a number 

 of rural schools indicate a widespread need for instruction in rural sanitation. 

 The author in the course of his investigations failed to find a single sanitary 

 privy installed for the use of rural school children. In numerous instances 

 no privy accommodations whatsoever were provided, and soil pollution in the 

 neighborhood of the schoolhouse was evident. 



RURAL ECONOMICS. 



Population, general report, and analysis {Thirteenth Census U. S., 1 {1910), 

 pp. 1369, pis. 12, figs. 90). — In this summary and analysis of the census data 

 statistics relating to the rural population have been shown as to the number 

 by age groups, by sex, and by nativity and parentage. The tables show the 

 conditions by States and geographic divisions for 1910 and in most instances 

 comparative data for earlier years. 



Occupation statistics {Thirteenth Census U. 8., 4 {1910), pp. 615, figs. 9). — 

 This volume of the census contains statistical data showing by geographic 

 divisions, States, and principal cities the number of persons engaged in specified 

 occupations by sex, age, and nativity. The table following shows the compara- 

 tive number of persons engaged in agriculture. 



