386 EXPERIMENT STATION EECOED. [Vol. 36 



only a thin crop was obtained, as much moisture was lost when it became 

 impossible to continue the mulch. In the second case the land received one 

 surface flooding after which it was cultivated by a spring tooth cultivator and 

 leveled. The land was then sowed and a mulch maintained. The average 

 yield of wheat was somewhat greater than the average yielded by simlar un- 

 manured land with six or seven irrigations. 



" It is clear that as far as irrigated wheat growing is concerned, there is an 

 enormous loss of water which might be profitably employed. The skillful use 

 of the lever harrow after rain would also increase the yield of the unirrigated 

 or dry crop wheat. Examined scientifically, the methods now in vogue are 

 wasteful in the extreme both as regards the irrigation water and the winter 

 rain and snow. To improve practice, two new implements are necessary — the 

 spring-tine cultivator and a pair of lever harrows. ... At a small cost, a 

 very material increase in wheat production is possible in the Quetta Valley." 



[Bead laws] {Montgomery, Ala.: State, 1916, pp. 16). — This is a circular 

 from the State Highway Department of Alabama to courts of county commis- 

 sioners and boards of revenue of the counties of Alabama suggesting laws, 

 rules, and regulations governing the working, maintenance, and preservation 

 of the public roads. 



Second report of the state engineer [of Arizona] to the state highway 

 commission, L. Cobb {Rpt. State Engin. Ariz., 2 (1915-1916), pp. 673, pis. 3, 

 figs. 118). — This is a report of the work and expenditures of the state engineer's 

 office on road and highway construction, maintenance, and repair in Arizona 

 for the fiscal years 1915 and 191G. 



The financial side of road improvement, B. K. Coghlan {Bui. Agr. and 

 Mech. Col. Tex., 3. ser., 2 {1916), No. 8, pp. 22, figs. 6; rev. in. Good Roads, 50 

 {1916), No 19, p. 202). — The author deals with the oconomics of road improve- 

 ment, with special reference to conditions in Texas. 



Demonstration roads at the Agricultural and Mechanical College of Texas, 

 R. L. IMoRRisoN {Bui. Agr. and Mech. Col. Tex., 3. ser., 2 {1916), No. 1, pp. 20, 

 figs. 15). — Brief descriptions and specifications for sample roads, used as a part 

 of the course of instruction in highway engineering at the Texas College, are 

 given. 



Earth roads, R. L. Morrison {Bui. Agr. and Mech. Col. Tex., S. ser., 1 {1915), 

 No. 2, pp. 20, figs. 14). — This bulletin describes and illustrates the processes and 

 machinery used in improving earth roads. 



Gravel roads, B. K. Coghlan {Bui. Agr. and Mech. Col. Tex., 3. ser., 1 

 {1915), No. 8, pp. 16, pis. 4, figs. 4). — This bulletin deals with the location, con- 

 struction, and maintenance of gravel roads, with special reference to conditions 

 in Texas. 



Highway bridges and culverts, B. K. Coghlan {Bui. Agr. and Mech. Col. 

 Tex., 3. ser., 1 {1915), No. 5, pp. 30, figs. 12).— This bulletin deals with the im- 

 portant features of proper inspection, repairs, replacement, and maintenance 

 of highway bridges and culverts and with the inspection of traffic as related 

 to these. 



Convict labor for road work, .T. E. Pennybacker, H. S. Palrbank, and W. F. 

 Draper {U. S. Dept. Agr. Btil. 414 {1916), pp. 218, pis. 14, figs. iO).— This re- 

 port, prepared in cooperation with the U. S. Public Health Service, deals with 

 " as nearly as possible all questions that might arise in connection with either 

 the adoption of a policy relating to the use of convict labor in road work or 

 the actual working out of such a policy. To this end a presentation and dis- 

 cussion of the principles involved, a digest of convict road laws, and a discus- 

 sion of every phase of operation are embodied in the bulletin, together with 

 specific detailed instructions for the carrying out of all recommendations." 



