Sept. 15. 1919 Temperature in Relation to Quality of Sweetcorn 283 



greater in Maryland than in Maine. The original quality and the 

 methods of handling being equal, corn handled at a mean tempera- 

 ture of 59.5° F., the mean temperature at Portland in September, must 

 inevitably be superior to corn handled at 74.6°, the mean tempera- 

 ture at Baltimore in August.' 



SUMMARY 



The rate at which sugar is lost increases with rise of temperature at 

 least up to 20° C. 



The rate of respiration also varies with temperature, being greater at 

 higher temperatures, at least up to 30° C. 



Observations in Maryland and in Maine indicate that the temperature 

 of green corn on the stalk while in the shade is usually near that of the 

 air, while in the sun it often is above that of the air. 



The corn-picking season in Maryland (August) has a much higher 

 average temperature than the corresponding season (September) in Maine. 

 The difference is sufficient to cause considerably greater deterioration in 

 picked corn during a given period. 



LITERATURE CITED 

 (i) Appleman, Charles O. 



T918. RESPIRATION AND CATALASE ACTIVITY IN SWEET CORN. In Amer. JoUf. 



Bot., V. 5, no. 4, p. 207-209. 



(2) ■ and Arthur, John M. 



19 19. CARBOHYDRATE METABOLISM IN GREEN SWEET CORN DURING STORAGE AT 



DIFFERENT TEMPERATURES. In Jour. Agr. Research, v., 17, no. 4, p. 

 137-152. 



(3) BiGELOW, F. H. 



1908. THE DAILY NORMAL TEMPERATURE AND DAILY NORMAL PRECIPITATION OP 



THE UNITED STATES. U. S. Dept. Agr. Weather Bur. Bui. R, 186 p. 



(4) Cox, Henry. 



I918. FROST AND TEMPERATURE CONDITIONS IN THE CRANBERRY MARSHES OF 



WISCONSIN. U. S. Dept. Agr. Weather Bur. Bui. T, 121 p., illus. 

 maps. 



(5) Fassig, Oliver Lanard. 



1907. REPORT ON THE CLIMATE AND WEATHER OF BALTIMORE AND VICINITY. 



In Marjdand Weather Service, v. 2, p. 27-514, 170 fig., 24 pi. 



(6) Lehenbauer, Philip Augustus. 



I914. GROWTH OF MAIZE SEEDLINGS IN RELATION TO TEMPERATURE. In Physiol. 



Researches, v. i, no. 5, p. 247-288, 4 fig. Literature cited, p. 287-288. 



(7) Livingston, Burton Edward. 



I916. PHYSIOLOGICAL TEMPERATURE INDICES FOR THE STUDY OF PLANT GROWTH 



IN RELATION TO CLIMATIC CONDITIONS. In Physiol. Researches, v. i, 

 no. 8, p. 399-420, 4 fig. Literature cited, p. 420. 



(8) and Livingston, Grace Johnson. 



I913. TEMPERATURE COEFFICIENTS IN PLANT GEOGR/\PHY AND CLIM.\TOLOGY. 



In Bot. Gaz., v. 56, no. 5, p. 349-375. 3 fig- 



1 The practical application of the facts here presented in such matters as home canning and handling are 

 too obvious to need comment. As indicated by Table V, com picked early in the morning is much cooler 

 and can be handled with much less loss of sugar than that picked later in the day. 



