60 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



this normal temperature, with a simultaneous diminution in the normal 

 annual rainfall, produces a plant in which the xerophytic characters pre- 

 dominate. Similarly any diminution of the normal temperature, com- 

 bined with an increase of the normal rainfall, induces in the plant a 

 robust and luxuriant growth. 



A further comparison has been effected between the various types, 

 namely, as regards their leaf percentages.* Here, again, the same grada- 

 tion, from the Sukkur type at one extreme to the Ganges-valley type at 

 the other, is observable. 



Fig. 13. — Delhi Plant. 



The figures are as follows : — 



Leaf percentage. 



(1) Sukkur area : 



Sukkur 70-6 



(2) Punjaub area : 



Bahwalpur 68*1 



Hansi ( = Hissar) 67-6 



Dera Gazi Khan 66-7 



Multan . . 62-5 



Mozuffergarh 62*1 



Average 65*4 



* A comparison primarily undertaken on account of the economic value of the 

 point under consideration. 



