As the author thinks that the acquirement of the 
tropical flora is the most important for the worker of the 
_natural system of the flowering plants, he has decided to 
start for Indo-China where he will stay for one year to’ 
accomplish his study in the midst of the tropical forests, 
observing every changing aspect of the flora through all 
seasous. It is kindly requested that any correspondence 
regarding -this paper on the” natural system should be 
forwarded to the following address :— . 
B. HAYATA 
Mitsui Bussan Kaisha 
No. 23, Rue Catinat, 
Saigon, Cochinchina 
