LITERATURE CITED. 



(1) Beattie, James H. 



1921. Tomatoes for canning and manufacturing. U. S. Dept. Agr., 

 Farmers' Bui. 1233, 20 p., 7 fig. 



(2) Habvey, R. B. 



1918. Hardening process in plants and developments from frost in- 

 jury. In Jour. Agr. Research, v. 15, no. 2, p. 83-112, 3 fig., 

 pi. 7-11. A (col.) Literature cited, p. 108-111. 



(3) 1919. Importance of epidermal coverings. In Bot. Gaz., v. 67, no. 5, 



p. 441-^144, 2 fig. 



(4) Tayeoe, Geoege F. 



1920. Some improvements on the needle type thermocouple for low 



temperature work. In Jour. Ind. and Eng. Chem., v. 12. 

 no. 8, p. 797-798, fig. 1. 



(5) Weight, R. C, and Hab\t;t, R. B. 



1921. The freezing point of potatoes as determined by the thermoelec- 



tric method. U. S. Dept. Agr. Bui. 895, 7 p., 1 fig. 



(6) Weight, R. C, and Taylor, George F. 



1921. Freezing injury to potatoes when undercooled. U. S. Dept. Agr. 

 Bui. 916, 15 p., 1 fig., 1 pi. Literature cited, p. 15. 



(7) [Yox^NG, Floyd Dh-lon]. 



1920. Frost and the prevention of damage by it. U. S. Dept. Agr., 

 Farmers' Bui. 1096, 48 p., 24 fig. 

 10 



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