488 EXPERIMENT STATION RECORD. 



use of the agricultural engineer, and summarizes a large amount of available 

 data. Part 1 is devoted to the more general scientific phases of the subject, and. 

 especially to soil formation, agricultural botany, and the principles of mechan- 

 ics and hydraulics. Part 2 discusses specific engineering problems, including 

 roads, irrigation, drainage, moor culture, and land surveying. 



Irrigation in Arizona, R. H. Forbes ( IJ. 8. Dept. Agr., Office Expt. 8tas. Bui. 

 235, pp. 83, pis. Jf, figs. 8). — This is one of the series of reports prepared in this 

 Office for the purpose of giving general information regarding the opportunities 

 for settlement on irrigated lands in the several Western States and TOi'ritories, 

 the cost of land and water and of establishing homes on these lands, and re- 

 garding the crops grown. It discusses the history of irrigation development in 

 Arizona, the area and topography, flora, industries, valuations, and population of 

 the Territory, its climate, crops, markets, lands, and water resources, the laws 

 and usages relating to irrigation, existing irrigation enterprises, and agricul- 

 tural practice, and the agricultural present and future. 



The water supply of Arizona available for irrigation purposes is estimated at 

 from four to five million acre-feet a year, or sufficient for from 800,000 to 

 1,000,000 acres, whereas it is estimated that in 1909 but 227,770 acres was 

 actually cultivated. " Five times the present area of doubly productive land 

 will yield an annual product worth $90,000,000, which, with a possible output 

 of $20,000,000 annually from grazing ranges, would give a total for the agricul- 

 tural industries of over $100,000,000 annually. This is well in excess of the 

 mining output of the Territory at the present time and suggests the possibility 

 that finally in Arizona, as in the once mining States of California and Colorado, 

 agriculture will become the leading industry." 



Irrig'ation in California, F. W. Roeding ( U. 8. Dept. Agr., Office Expt. Stas. 

 Bui. 287, pp. 62, pi. J, flgs. 17). — This is another of the series of reports dealing 

 with irrigation in the arid States and Territories, and has been prepared by this 

 Office in cooperation with the State of California for the purpose of answering 

 inquiries regarding conditions and the opportunities and cost of settlement. 



Following a general discussion of the climate, population, industries, assessed 

 valuation, and transportation facilities of the State, the water resources, lands, 

 and products are discussed in detail, together with the history of irrigation 

 development, water laws, various irrigation enterprises, and the cost of prepar- 

 ing land for irrigation. 



The area of irrigable lands in California under present systems is computed 

 to be 3,876.000 acres, of which about 2,500,000 are being actually irrigated. 

 " With better laws to control and regulate diversions from the streams of the 

 State, and therefore a guaranty for the safe investment of capital in irrigation 

 enterprises without expensive litigations which have been incident heretofore 

 with appropriations from the natural water courses, the State can expect a 

 much larger population throughout the agricultural districts and a great addi- 

 tion to its wealth." 



The use of underground water for irrigation at Pomona, Cal., C. E. Tait 

 (U. S. Dept. Agr., Office Expt. Stas. Bui. 236, pp. 99, pis. 5, figs. S).— The work 

 upon which this report is based was done in cooperation between this Office and 

 the State of California. 



" The Pomona Valley is typical of localities in the citrus belt of southern 

 California, where water has a high agricultural value, but can be secured only 

 at high cost. Much of the water is pumped, and there is no other section where 

 water is used more economically or where greater effort is made to improve 

 methods of development, distribution, and application. This report describes 

 the problems confronting the irrigators, the methods employed, and the progress 

 made in the economical use of the water resources," 



