788 EXPERIMENT STATION RECORD. 



Irrigation works, H. Brown (London, 1910, pp. 34, pis. 2). — This pamphlet 

 contains lectures on the scope of irrigation works and features of their design 

 and construction. 



Irrigation by gravity, L. Fontaine (Rev. Tit., 86 (1911), No. 928, pp. S58~ 

 863, figs. 10). — This article points out the benefits of irrigation and outlines the 

 general methods of surveying and computing profiles and grade lines for gravity 

 irrigation. The more practical and economical methods of conveying water 

 down hillsides are described and the details of a practical method of gravity 

 irrigation are explained. Different styles of headgates to regulate the flow of 

 water into these laterals are discussed. 



Irrigation in correct practice, A. Wolf (Northwest Hort., 25 (1912), No. 3, 

 pp. 72. 73). — This is an abstract from an address made by S. O. Jayne before 

 the Ellensburg Farmers' Institute. 



The author states that the essentials of successful irrigation are an adequate 

 supply of water and the right use of the water. Inasmuch as the chief function 

 of water is that of a medium by which the nutrients in the soil may be taken 

 up by the plant roots, the soil should be carefully prepared and the flow of water 

 well regulated in order to secure a uniform distribution of moisture. The char- 

 acter of the soil and nature of the crop should be considered in preparing the 

 soil for irrigation and in regulating the amount of irrigation, as these factors 

 vary with different crops and kinds of soils. In regulating the irrigation flow 

 the irrigator should exercise judgment as to when to begin irrigating, when to 

 stop, and how much cultivation and fertilization is required. 



Chart for solution of problems in irrigating waters, H. C. Ogden (En gin. 

 Rec, 65 (1912), No. 10, p. 275, fig. 1). — A chart for use in calculating deliveries 

 of irrigating water on the second-foot or acre-foot basis is described. 



A preliminary report on drainage reclamation in Georgia (Geol. Survey 

 Ga. Bui. 25, 1911, pp. 123, pis. 12). — This includes a preliminary report on 

 Drainage 'Conditions in Georgia, by S. W. McCallie, state geologist, and a 

 report on drainage examinations and surveys conducted by the Drainage In- 

 vestigations of this Office, 1908-1911. 



The investigations show that the Georgia swamp lands aggregate 2,700,0<X) 

 acres and that the largest individual tract, the Okefiuokee swamp, comprises 

 an area of about 500,000 acres. The waste lands needing drainage are discussed 

 under the subheads of swamp lands, overflow lands, wet lands, and salt-marsh 

 lands. 



The State Geological Survey of Georgia reports on the drainage investiga- 

 tions and surveys of about 32,000 acres of swamp and overflow lands in the 

 counties of Baker, Calhoun, and Dougherty, giving the methods and details of 

 the surveys. The results showed that although the country is quite flat and 

 the velocity of the streams very small, drainage ditches can be constructed with 

 proper cross section and sufficient fall to reclaim this entire territory. 



Reports of various preliminary investigations are submitted for Bryan, 

 Chatham, Clinch, and Echols counties, by J. V. Phillips ; for Glynn, Liberty, and 

 Mcintosh counties, by F. G. Eason ; for Telfair County, by J. R. Haswell ; and 

 for Floyd and Jackson counties, by L. L. Hidinger. The investigations in each 

 county are discussed under the subheads of location and description of swamps, 

 natural drainage channels and outlets, typical areas needing drainage, past 

 drainage, soil character, general topography, rainfall and run-off, present farm- 

 ing conditions, and opportunities for reclamation. Special attention is given to 

 the improvements of the McRae branch in Telfair County, the Berry School Farm 

 in Floyd County, and the Mulberry River in Jackson County, Watershed and 

 location maps, rainfall data, and specifications for each improvement are also 

 given. 



