Sept. 15. 1919 Temperature in Relation to Quality of Sweetcorn 279 



Table IV. — Temperature (°C) of ears of green sweetcorn on the stalk on clear days 



1 The temperatures in Maryland were taken by Mr. William E. Seifriz. 



TEMPERATURE AT CORN-PICKING TIME IN MARYLAND AND IN MAINE 



In attempting to study the temperature of different regions in their 

 relation to plant growth the investigator must still depend chiefly on 

 meteorological data taken in cities. Thus Cox (4, p. 10), working on so 

 highly specialized a crop as the cranberry, in order to compare the differ- 

 ent regions was forced to use temperature readings observed in shelters 

 over hard land, even though his own work had shown the great difference 

 between air temperature over the marshes and air temperature over hard 

 land. 



In comparing the temperature of the corn-canning districts of Mary- 

 land and Maine, use will be made of the data from the observation 

 stations of the Weather Bureau at Baltimore and Portland. The sweet- 

 corn canning district of Maryland extends from Dorchester County 

 north to Harford County and west to Frederick County. The most 

 important localities lie north and west of Baltimore. In Maine, corn is 

 canned commercially from northern York County to southern Penobscot, 

 the most important localities lying north and west of Portland. It is 

 probable then that the observations at Baltimore and at Portland furnish 

 a fairly reliable index of the difference in temperature between the 

 sweetcorn producing districts of Maryland and Maine. Maryland and 

 Maine were chosen for comparison because they are the most southerly 

 and the most northerly of the important corn-canning districts on the 

 Atlantic seaboard and were among those included in the work of Straughn 



