28o 



Journal of A gricultural Research voi. xvii, no. e 



and Church. The exact date on which sweetcorn reaches edible condi- 

 tion naturally varies somewhat with different seasons;' but corn-canning 

 time in Maryland almost always falls during August, and in Maine during 

 September. In order, then, to give some idea of the temperature condi- 

 tions under which sweetcorn is handled in the two States, it will be neces- 

 sary to compare the temperature of Baltimore in August with that of 

 Portland in September. 



Table V. 



-Daily normal temperatures and corresponding indices for Baltimore, Md., 

 August 2 to ji, and Portland, Me., September I to JO 



Table V gives the daily normal mean temperatures of Baltimore, Md., 

 from August 2 to 31 and of Portland, Me., from September i to 30, with 

 three sets of corresponding temperature efficiency indices. The normal 

 mean temperatures are those calculated by Bigelow (j) from obser\^ed 

 temperatures. That mean temperatures furnish only a very unsatis- 



1 The harvest dates given by Straughn and Church (14) are: for Maryland, first week in August, 1905: 

 about the first of August, 1906; about Aug. 15, 1907; and Aug. 23, 1908; for Maine, about Sept. 15, 1505; 

 Sept. 25, 1906; frost before crop matured, 1907; and Sept. 19, 1908. 



