94 



crops other than grass, attention would have to be given to the natural 

 rainfall in the application of water by irrigation lest oversaturation of 

 the soil and a positive waste of water should occur. 



If it is regarded that ample irrigation has been provided when 2 

 inches of water is supplied every 10 days as a minimum, and 4 inches 

 as a maximum, then to meet this demand there would be required for 

 1 acre a continuous flow of water at the rate of 0.5042 cubic foot, or 

 3.77 gallons, per minute for 2 inches and 1.008 cubic feet, or 7.54 

 gallons, per minute for 4 inches. An area of 10 acres would require a 

 rate of flow 10 times as rapid, or 5.04 cubic feet per minute for the 

 minimum and 10.08 for the maximum. 



These amounts of water expressed in cubic feet and in gallons are 

 as follows : — 



Cubic feet. Gallons. 

 For 1 acre 2 inches deep, 7,260= 54,310 

 For 1 acre 4 inches deep, 14,520= 108,620 

 For 10 acres 2 inches deep, 72,600= 543,100 

 For 10 acres 4 inches deep, 145,200= 1,086,200 



If these amounts of water are stored in circular reservoirs with 

 vertical sides and 3 feet deep their diameters will be, respectively, 

 55.5 feet, 78.6 feet, 175.5 feet, and 248.5 feet. 



ADDITIONS AND CONTRIBUTIONS TO THE 

 DEPARTMENT. 



Library (Serials). 

 Europe. 



British Isles. 



Botanical Magazine, May. [Purchased.] 

 Chemist and Druggist, May 3, 10, 17. [Editor.] 



Colonial and Diplomatic and Consular Reports, Mar., April. [Col. Sec] 



Garden, May, 3, 10, 17, 24. [Purchased.] 



Gardeners' Chronicle, May, 3, 10, 17, 24. [Purchased,] 



International Sugar journal, May. [Editor.] 



Journal of Botany, May. [Purchased,] 



Journal, Royal Colonial Institute, May. 



Journal, Royal Hort. Society, April. 



Nature, April 24, May, 1, 8, 15, 22. [Purchased.] 



Pharmaceutical Journal, May, 3, 10, 17, 24. 



France. 



Sucrerie indigene et coloniile, May, 6, 20f [Editor.] 



German y. 



Beihefte zum Tropenpflanzer, May. 

 Tropenpflanzer, May. [Editor.] 



Holland. 



~ Bulletin, Koloniaal Museum, No. 26, [Editor.] 

 Belgium. 



Bulletin de la Socie^e" d' Etudes ^oloniales. May. 



