392 



EXPERIMENT STATION RECORD. 



[Vol. 43 



placing the posts in a 3 per cent zinc chlorid solution for 2i hours at a temr 

 perature of 200°. All the posts were serviceable for about four years and a 

 very few were still serviceable at the end of seven years. 



Time-saving equipment for handling growing cliicks, G. II. Sho^jp (Wash- , 

 ington Sta., West. Wash. ,S'i«. Mo. Bui., 8 {1920), No. 2, pp. 2^-28, figs. /,).— 

 Forced roost equipment, an outside feeding liopper, and automatically filled 

 water troughs are described and illustrated. 



Potable water for country houses ( Univ. Tucumdn, Ext. Afjr. Bol. 35 

 11919], pp. 1-11, figs. Jf). — This report deals with wells and springs and their 

 contamination and protection, with reference to conditions and practice iu 

 Argentina. The use of cemented brick, cemented tile, and concrete well linings 

 is recommended, with a concrete seal at the top in all cases. 



Disinfection by boiling and chlorination is also briefly discussed. 



RURAL ECONOMICS. 



Factors affecting labor and miscellaneous costs of producing crops, 



C. W. MoJNTGOMERY (Mo. Btil. OUio Sttt., 5 (1920), No. 5, pp. 154-15S).— Account 

 is rendered of man, horse, and tractor hours and miscellaneous costs, including' 

 seed, manure, green manure crops, lime, thrashing, twine, coal, etc., of^ 

 producing crops without regard for investment in land, buildings, overhead^ 



charges, or depreciation. The costs shown as determined on the Northeastern. 

 Test Farm, Cuyahoga County, Ohio, may be summarized as follows : 



Miscellaneous crop costs, Northeastern Test Farm, 1917-1919. 



The 5-year average yield and value per acre for 3-year and 5-ycar rotations 

 on the above farm, 1915-1919, are tabulated. Comparison is made of figures 

 secured at other county experiment farms from wliich tlie conclusion is arrived 

 at that the factors influencing the cost of producing a corn crop, leaving out 

 tlie value of land, buildings, tools, and overhead charges are (1) the natural 

 soil conditions, (2) getting a good seed bed, (3) getting a good stand, (4) 

 weed infestation and disease infection, (5) weather conditions, and (6) price of 

 labor and cost of soil amendments. 



[Economic and crop conditions on the Yuma Reclamation Project in 

 1918], R. E. Blair {U. S. Dcpt. Agr., Dcpt. Circ. 15 (1920), pp. 3-10, 13-21, 

 23-25, 77, figs. 10). — In these pages of tliis report a summary is given of irriga- 

 tion development on the Yuma Reclamation Project during the 7-year period 

 from 191.; to 1919, inclusive, the items of comparison relating to the amount of 

 watei used, area irrigated, population, operation of farms, and value of crops. 



It is noted that the number of farms being operated by tenants dwreased 

 frcm 6ti.2 ptr cenc during 1917 to 40.9 per cent during 1918, tliis condition bein^ 

 probably due iu part tc the fact that the prospects for good prices induced 

 liiiujy landowners to operate their ovni farms. 



