VARIATION IN 1NDIGOFERA SUMATRANA, GAERTN. 



63 



indicate the limit of variation which the various climatic conditions are 

 capable of inducing. 



In connection with this subject it would have been interesting to 

 establish the degree of stability of these various types. Unfortunately the 

 period of observation has not been sufficiently prolonged. There are, 

 however, indications that the plant of the Punjaub type, when cultivated 

 under conditions approximating to those of the Ganges valley, completely 

 loses its characteristics, so that it cannot be separated from the plant long 

 cultivated in the latter area. The period during which this change can 



Fig. 16. — Cawnpur Plant. 



be effected is, as far as has been ascertained, five or six years. It will not 

 be advisable, however, to accept this statement without reservation, since 

 the facts are not the result of personal observation. 



EXPLANATION OF FIGURES. 



(4) Plant from Chaubepur ( = Cawnpur). 



(5) European is standing among plants from Sukkur. 

 Native is standing among plants from Multan. 



(6) Plant from Sukkur. 



(7) Plant from Dera Gazi Khan (same scale as 10). 



(8) Plant from Multan (same scale as 10). 



(9) Plant from Mozuffergarh (same scale as 10). 

 (10) Plant from Bahwalpur. 



