28 



MAIZE 



CHAP. 

 II. 



1856-1875 

 1876-1896 

 1 897 -1 goo 



62-9° 

 6i'5° 

 63-1° 



The maximum temperature is said seldom to exceed 95° Fahr., 

 though it seems much higher owing to the excessive humidity. 

 The maize zone lies between summer isotherms 7 1 "6° and 

 78'8° Fahr., and annual isotherms 59° Fahr. and 68° Fahr. 



Table I. 

 COMPARATIVE TABLE OF MEAN MONTHLY TEMPERATURES. 



1 The heaviest maize yields of the United States have been grown between 

 July ( = January) isotherms 75° and 8o° Fahr. 



-Various periods from 1855 to igoo. ■' May to August inclusive. 



In the Transvaal it is generally considered that the Lower 

 Bush-veld (below 2,000 feet), though hotter, cannot compete 

 with the High-veld in the production of maize ; if this is 

 actually the case it is probably due largely to the character of 



