60 



INFLUENCE OF ENVIRONMENT ON SWEET CORN. 



curves representing rainfall and percentage of sugars indicate this 

 relation. The intersection of the rainfall and sugar content lines at 

 the Maine station is, hi reality, no exception, as less rain is needed 

 in the colder climate. 



In figure 6 the line representing the percentage of sugar follows 

 somewhat the percentage line for sunshine. This was even more 

 striking in the 1906 work and is in accord with the accepted theories. 

 Direct sunshine does not, however, appear to control the formation 

 of sugars to quite the extent that has been supposed. In most cases 



FIG. 6. Four years' summary: Average percentage of sugar in the corn, sunshine record, rainfall, and 



latitude of station. 



the percentage of sugars varies inversely with the latitude and 

 directly with the temperature, and this fact is in direct opposition to 

 that noted in the studies on sugar beets. Maine, however, consti- 

 tutes a notable exception. 



On comparing the averages of the total sugars for each station, 

 South Carolina shows a percentage of 24.42 and Maine of 23.96. In 

 connection with this it should be borne hi mind that the average 

 obtained for South Carolina includes the Stowell Evergreen with the 

 Crosby variety. In Maine only one variety was grown, and that was 

 the Crosby. If the Crosby variety had been used alone for South 

 Carolina, the average would have been 27.21 per cent. 



