184 THE BOTANICAL MAGAZINE. [Vol. xxix. No. sue. 



The present study was- commenced in 1907 at the Botanical 

 Laboratory, Agricultural College, Satporo, continued there till 



1909, carried on for a time at the Jodrell Laboratory, Kevv, in 



1910, at the Botanical Department, Royal College of Science 

 in 1911, and completed in Kew Herbarium in 1915. The writer 

 takes this opportunity to express his thanks to the authorities 

 of the above mentioned establishments for giving him facilities 

 to carrv out his studv- 



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