THE ECOLOGY OF THE UPPER GANGETIC PLAIN. 303 



Climatic seasons. From the foregoing it will be seen that the 

 climate is markedly periodic, and divides quite naturally into three 



Jan. Feb. Mar. Apr. /fay Tun, Jul A*g,5<ip. Oct./Yt>*. Or 

 A?oqf~t;s 



Z 4 6 3 10 IZ 14 16 IB ZO ZZ 2A- 



Fig. 3 



Hours of r(/e day 



Fi& 



Fig. 3. Mean temperature in degrees Fahrenheit, mean cloudiness on the 

 scale of — 10, mean rainfall in inches, and mean relative humi- 

 dity in per cent, for the year at Allahabad. 



Fig. 4. Mean hourly temperature in degrees Fahrenheit and mean relative 

 humidity in per cent, for the month of July at Allahabad. 



seasons : a Rainy Season ; a Cold Season ; and a Hot Season, (Fig. 3). 



Corresponding with the climatic seasons there are three distinct 



Table V 



Hourly mean temperature in degrees Fahrenheit and mean relative 

 humidity in per cent., on the even hours, for the months of April, July and 

 December, at Allahabad. 



