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JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



extreme heat is associated with the minimum amount of rain, the intensity 

 of both of which conditions is reduced in the case of the Punjaub districts, 

 the reduction being more noticeable in the case of Hissar. The Ganges 

 area, again, shows a still further reduction, both in the intensity of the 

 temperature and in the scarcity of the rainfall. 



The Jhind and Hissar areas require a somewhat closer examination. 

 Geograpically these two areas lie but a short distance from each other, 

 and both lie considerably nearer the Ganges than the. Punjaub area ; yet, 

 as has been shown above, the Hissar plant conforms in all respects with 

 the Punjaub type, while the Jhind plant combines the characters of the 

 plant from both areas. Reference to Maps L and III., in which the desired 



Fiu. 12. — Jhind Plant. 



points are best indicated, shows that both the line indicating the 20-inch 

 normal annual rainfall and that indicating the 90° F. normal annual 

 maximum temperature bend in a northerly direction, thus passing through 

 Jhind and placing Hissar within the region of intense temperature and 

 low rainfall ; the Ganges area falls within the region of less intense 

 temperature and higher rainfall. The necessary conclusion is that a 

 normal annual rainfall of 20 inches combined with a normal annual 

 maximum temperature of 90° F. forms the limiting climatic condition of 

 the two main types. On these lines — which, where they pass through the 

 districts in which indigo is cultivated, happen to be practically coincident — 

 an intermediate type of plant (the Jhind type) is found. Any increase on 



