216 MISC. PUBLICATION 5 4 ; U. S. DEPT. OF AGRICULTURE 



essential when dehydration is used. In fact, when the latter method 

 is used a cold-water wash is more satisfactory. Prune powder is made 

 by a process similar to that used to make apricot powder. The dried 

 prunes are first pitted; then they are ground, and dried to a low 

 moisture content in vacuum. 



LITERATURE CITED 



(1) Adam, W. B., Horner, G., and Stanworth, J. 



1942. CHANGES OCCURRING DURING THE BLANCHING OF VEGETABLES. SOC. 



Chem. Indus. Jour. 61 : 96-99. 



(2) American Society of Heating and Ventilating Engineers. 



1943. HEATING, VENTILATING AND AIR CONDITIONING GUIDE. 1160 pp., illuS. 



New York. 



(3) Anker, C. A., Geddes, W. F., and Bailey, C. H. 



1942. A STUDY OF THE NET WEIGHT CHANGES AND MOISTURE CONTENT OF 



wheat flour at various relative humidities. Cereal Chem. 

 19 : 128-150, illus. 



(4) Association of Official Agricultural Chemists. 



1940. official and tentative methods of analysts . . . ed. 5, 757 pp., 



illus. Washington, D. C. 



(5) Ballif, P. S., and Dryden, H. L. 



1931. FURTHER MEASUREMENTS OF PROPELLER FAN CHARACTERISTICS. U. S. 



Natl. Bur. Standards Res. Paper 283 : 357-399, illus. 



(6) Beadle, G. W., and Zscheile, F. P. 



1942. studies on the carotenoids. ii. the isomerization of beta-caro- 

 tene AND ITS RELATION TO CAROTENE ANALYSIS. JOUI". Biol. Chem. 



144 : 21-33, illus. 



(7) Caldwell, J. S. 



1923. evaporation of fruits. U. S. Dept. Agr. Bui. 1141, 64 pp., illus. 



(8) Carrier, W. H. 



1938. fan engineering. 739 pp., illus. New York. 



(9) Chace, E. M., Noel, W. A., and Pease, V. A. 



1941. PRESERVATION OF FRUITS AND VEGETABLES BY COMMERCIAL DEHYDRA- 



TION. U. S. Dept. Agr. Cir. 619, 46 pp., illus. (Slightly revised, 

 1942.) 



(10) Chatfield, C, and Adams, G. 



1931. PROXIMATE COMPOSITION OF FRESH VEGETABLES. U. S. Dept. Agr. Cir. 



146, 24 pp. 



(11) Christie, A. W. 



1926. the dehydration of prunes. Calif. Agr. Expt. Sta. Bui. 404, 47 

 pp., illus. 



(12) Conner, R. T., and Straub, G. J. 



1941. COMBINED DETERMINATION OF RIBOFLAVIN AND THIAMIN IN FOOD PROD- 



UCTS. Indus, and Engin. Chem., Analyt. Ed. 13: 385-388, illus. 



(13) Cruess, W. B. 



1919. evaporators for prune drying. Calif. Agr. Expt. Sta. Cir. 213, 

 30 pp., illus. 



(14) Eidt, C. C. 



1938. PRINCIPLES AND METHODS INVOLVED IN DEHYDRATION OF APPLES. 



Canada Dept. Agr. Pub. 625 (Tech. Bui. 18), 33 pp., illus. 



(15) Furnas, C. C. 



1930. HEAT TRANSFER FROM A GAS STREAM TO A BED OF BROKEN SOLIDS. 



II. Indus, and Engin. Chem. 22 : 721-731, illus. 



(16) Gamson, B. W., Thodos, G., and Hougen, O. A. 



1943. heat, mass and momentum transfer in the flow of gasses through 

 granular solids. Amer. Inst. Chem. Engin. Trans. 39: 1-35, 

 illus. 



(17) Goodman, W. 



1942. fan laws — their derivation and use. Heating, Piping and Air 



Conditioning 14 (8): 487^490, illus; (9): 535-537, illus; (10): 

 617-619. 



(18) Gore, H. C, and Rutledge, L. F. 



1921. control of the darkening of dehydrated potatoes. Chem. Age 

 [New York] 29 : 457^58, illus. 



