182 EXPERIMENT STATION RECORD. 



supplemental irrigation by spraying. The system consisted of an engine-driven 

 centrifugal pump discharging 320 gal. of water per minute into 1,800 ft. of 

 movable 4 in. distribution pipe. Three sprays, each covering an area of 4,300 

 sq. ft. were moved from place to place on carts operated by windlass and wire 

 cable. The entire system cost about $3,200 and water was applied at a total 

 cost of 1.75 cts. for each 200 gal., or about $21 per acre-foot. 



The rainfall in this locality between April and September was about 10 in. 

 during which season 1.2 in. of water was applied to rye, barley, and potatoes to 

 supplement the rainfall. The increase in the crop of rye and barley yielded a 

 net profit of 6 cts. and the potatoes a net profit of 7 cents for each cubic meter 

 of water applied. 



The results in general are considered favorable to the profitableness of 

 spraying irrigation on small or medium sized plats of ground. It Is con- 

 cluded that several improvements may be made to reduce th<' cost of the plant 

 and of applying the water. 



Porto Rico irrigation service, J. A. Wilson (War. Dept. [U. S.], Ann. Rpt. 

 Governor P. R., 12 {1912), pp. 159-178). — This report covers the operations and 

 expenditures on the irrigation projects of Porto Rico for the fiscal year ended 

 June 30, 1912. 



Irrigation in Catalonia and Aragon, H. H. Morgan (Daily Cons, and Trade 

 Rpts. [U. /S.], 16 (191S), No. 79, pp. 81-8^).— This reports the present status 

 of irrigation and irrigation works in these distincts of Spain. 



It is stated that only about 6 per cent (3,088,750 acres) of the total culti- 

 vated area of Spain is under irrigaton. Of this, 741,300 acres are Included in 

 Catalonia, 247,100 acres being irrigated by canals, and the remainder by means 

 of trenches, pumping stations, or artesian wells. Existing and proposed irri- 

 gation works in the 2 districts are desci'ibed, and It is estimated that the con- 

 struction of proposed works will cost $28,932,181, that the annual value of 

 crops in the zone of the proposed work will amount to $18,000,000, and that 

 the land will be worth $81,000,000. 



Fifth biennial report of the state engineer of North Dakota, T. E. Atkin- 

 son (Bien. Rpt. State Engin. N. Dak., 5 (1911-12), pp. 127). — This reports on 

 irrigation and irrigation works, drainage and drainage works, coal mines and 

 coal mine Inspection, the design and construction of county roads and bridges, 

 and the design and construction of waterworks and sewers for state institu- 

 tions, including a financial report and a large amount of tabulated data. 



Proceedings of the fifth annual drainage convention held at Raleigh, N. C, 

 compiled by J. H. Pratt (N. C. Geol. and Econ. Survey, Econ. Paper SI, 1912, 

 pp. 56, pis. 6). — This pamphlet contains the proceedings of this convention, and 

 includes papers on the reclamation of swamp lands, by M. V. Richards; the 

 drainage of Haarlem Lake, Holland, by C. G. Elliott ; North Carolina drainage 

 bonds, by M. W. Thompson; suggested changes in the North Carolina drainage 

 law, by L. Brett ; the need of drainage engineers, by G. H. Hill ; and the use of 

 dynamite in connection with drainage, by J. H. Squires. 



The V/hite Plains road experimental pavements, W. H. Connell (New 

 York, 1911, pp. j}7, pis. 28). — Experiments were conducted with a view to deter- 

 mining by a service test a suitable medium-priced pavement for country roads 

 and parkways. The experimental pavements consisted of 18 sections, ranging 

 In length from 100 to 350 ft. with a width of 21 ft. Fourteen of these sections 

 comprise a bituminous pavement group, and 2 of these consisted of a wearing 

 surface of broken stone and sand with an asphaltic binder, built by the mixing 

 method and laid on a concrete foundation. The wearing surfaces of 12 sections 

 were laid on a broken stone foundation, 5 built by the penetration, and 7 by the 

 mixing method. In all but 1 section built by the mixing method the stone was 



