1917] 



RURAL ECONOMICS. 



91 



tractor's Suggestion to Engineers and Inspectors, by J. H. Gordon ; Different 

 Conditions and Localities, by F. C. Pillsbury ; Roads at Low Cost for Moderate 

 Traffic, by F. E. Everett; Foundations for Road and Street Pavements, by 

 J. W. Hunter ; Brick Streets and Roads, by H. E. Breed ; Recent Tendencies in 

 Stone Bloclc Pavements, by C. F. Knowlton; and The Functions Performed by 

 Stone in tlie Bituminous Concrete Pavement, by R. B. Gage. 



Unit stresses for timber: Manufacturers' table {Engin. News, 76 {1916), 

 No. 6, p. 273). — Working unit stresses for structural timbers used in dry loca- 

 tions are given in the following table : 



Working unit stresse.f for structural timbers used in dry locations. 



Species ot timber. 



Bendin". 



Stress in 



extreme 



fiber, per 



square inch. 



Horizontal 



shear per 



square inch. 



Compression. 



Parallel to 



grain 



"short 



columns," 



Perpen- 

 dicular to 

 fn"ain, per 



per square square inch, 

 inch. 



Fir, Douglas: 



Dense grade 



Sound L'rade 



Hemlock, eastern 



Hemlock, western 



Oak 



Pine, eastern white 



Pine, Norway 



Pine, southern yellow: 



Dense grade 



Sound grade 



Spruce 



Tamarack 



PoiiTtds. 

 1,600 

 1,.')00 

 1,000 

 1.300 

 1,400 

 900 

 1,100 



1,600 

 1,300 



000 

 1,200 



Pounds. 



100 

 85 

 70 

 75 



125 

 80 

 85 



125 

 85 

 70 

 95 



Pounds. 

 1,200 

 900 

 700 

 900 

 900 

 700 

 800 



1,200 

 900 

 600 

 900 



Pounds. 



350 

 300 

 300 

 300 

 400 

 250 

 300 



350 

 300 

 200 

 350 



New dairy cattle bams, E. S. ABCHiBAr.D (Canada Expt. Farms Rpts. 1915, 

 pp. Jfl8--'f24, pis. 9). — Plans, photographs, and brief specifications for the dairy 

 barns recently constructed at the Central Experimental Farm at Ottawa, 

 Ontario, Canada, are given. 



The homemade stave silo, J. N. Pbice (Wash. State Col. Ext. Dept., Ser. 1, 

 No. 2Jt (1916). pp. 16, figs. IS). — It is the purpose of this publication to give 

 bills of material, illustrations and full instructions for building the stave silo 

 with either plain or tongued and grooved staves and with either of the two types 

 of doors. 



Pit silos and how to make them, A. L. Paschall (Ariz. Col. Agr. Ext. Serv. 

 Circ. 8 (1916), pp. 28, figs. 22). — This circular contains a compilation of the ex- 

 periences of farmers in Cochise and Santa Cruz counties, Ariz., with pit silos, 

 together with information on the subject from several of the state agricultural 

 experiment stations. 



EUEAI ECONOMICS. 



Can the farmer realize higher prices for his crops by holding them? J. E. 

 Pope (Quart. Jour. Econ., 30 (1916), No. 4, pp. 805-831) .—The author, after 

 studying the variation in the monthly prices of important agricultural products, 

 the cost of storage, interest, and other expenses of holding crops, concludes that 

 in the long run it will not pay the farmer to follow this practice. 



Marketing farm produce by parcel post and express, B. H. Hibbabd and A. 

 HoBSON (Amer. Econ. Rev., 6 (1916), No. 3, pp. 589-608, figs. 8).— The authors 

 point out that it is feasible to market only a small portion of the farm products 



