CHAP. 

 II. 



30 MAIZE 



Table III. 



MEAN MONTHLY TEMPERATURES, TRANSVAAL. 



Bethal (5,580 feet). 



The above tables show the mean monthly temperatures 

 of the four growing months for maize, November to February- 

 inclusive. In the case of the Transvaal stations the means 

 are for the seven years 1903 to 1910 inclusive (Iwies, i), and 

 are obtained by halving the sum of the mean daily maximum 

 and the mean daily minimum. The Rhodesian figures are 

 those given by Mr. Hutchins (1), and the Georgia figures are 

 the means for thirteen years as furnished by Director Redding 

 (1) ; the latter are for the corresponding summer months of 

 May to August inclusive. The Iowa figures are from Bowman 

 and Crossley (ij. 



24. Night Temperature. — Some writers (Darwin, 2 ; Harsh- 

 berger, 1) conclude that the maize crop does not flourish where 

 the nights are "cool," no matter how favourable the other 



