488 EXPERIMENT STATION RECORD. 



contains plans for economical and sanitary dairy barns and milking sheds, with 

 bills of materials. 



Practical instructions for building inexpensive stave silos, P. Rowe (Dept. 

 Agr. and Immiyr. Ya., Dairy and Food Div. Bui. J^8 (1915), pp. 2n, figs. 10). — 

 This, a revision of Bulletin 24 (E. S. R., 29, p. 789), is a popular description of 

 the construction of stave silos. 



Building concrete silos, C. D. Gllbekt (Concrete-Cement Age, 1 (1915), Nos. 

 1, pp. 3-6, 37, 38, figs. 11; 2, pp. 58-62, 82, 83, figs. 21).— It is the purpose of 

 these two articles to consider briefly the advantages of various types of silo 

 construction from the viewpoint of its development in different localities and 

 under varying conditions and also to consider the common features of all silo 

 work. 



The first article deals with unit construction with blocks and staves, and the 

 second with monolithic construction and types of equipment. A .special feature 

 discussed under monolithic construction is the silo water tank. 



Electric light and power for country homes, D. L. Mabkle (Ann. Rpt. Penn. 

 State Col. 1912, pp. 101-111, pis. 16). — This article describes the methods and 

 apparatus used in generating electrical power for farm use, especially for 

 lighting. 



Illuminating power of kerosenes used in Iowa, W. Kunebth (Proc. Tatca 

 Acad. Sci., 21 (1914), pp. 241-254). — The substance of this article was noted 

 from a previous report (E. S. R., 32, p. 487). 



A study of methods of sewage disposal in industrial and rural communi- 

 ties and suggestions for their improvement, J. F. Siler, P. E. Garkison, and 

 W. J. MacNeal (Amcr. Jour. I'uh. IlatUh. 5 (1915), No. 9, pp. 820-832).— Thisi 

 paper reviews briefly the usual methods employed for the disposal of human 

 excreta in industrial and rural communities in the South, and discusses in detail 

 methods of actual improvement, the cost thereof, and the benefits deriveil there- 

 from. 



It is pointed out that in southern rural districts about half the population is 

 without any provision for the di.sposal of excreta. " In industrial communities 

 open surface privies are most usual, water-carriage systems rare. Complete 

 water systems and sewage-disposal plants can be installed in cotton-mill villages 

 at an expense varying from .$210 to $265 per house. A rental charge of $1 to $2 

 per house per month for such improvement would suffice to maintain it and also 

 yield a small interest return on the investment." 



Brief notes of experiments in sewage purification by forced aeration, J. P. 

 Wakefoud (Surveyor, 48 (1915), No. 1228, pp. 132, 133).— From the results of 

 experiments on both a large and a small scale it is concluded that the practical 

 application of the aeration principle of sewage purification will improve sanitary 

 conditions with less extensive equipment and a reduction in capital and main- 

 tenance costs, and that the residual sludge, owing to the ease with which it can 

 be handled and its high nitrogen content, will be more readily converted into 

 a valuable fertilizing agent. 



RTJRAL ECONOMICS. 



Studies in the land problem in Texas, edited by L. H. Hanev (Bui. Unii\ 

 Tex. No. S& (1915), pp. 181, figs. 2).— This bulletin contains the following 

 papers : The Land Problem in Texas, and The Single Tax, by L. H. Haney ; 

 The Recent Increase in Tenancy, its Causes, and Some Remedies, by W. E. 

 Leonard and E. B. Naugle; A Study in the Size of Farms in Texas, by J. G. 

 Crtissom; Housing Conditions among Tenant Farmers, by G. S. Wehrwein; 



