1905] OLSSON-SEFFER—PH YTOGEOGRAPHIC NOMENCLATURE 193 
A technical term should be defined clearly, so as to leave no doubt 
as to its significance. Authors should desist therefore from pro- 
posing new terms in mere catalogues. 
A new term should be published in some work accessible to scien- 
tific workers. 
Vernacular names should not be excluded from phytogeographical 
nomenclature, but they must in every case be definite and give rise 
to no ambiguity. 
An international committee of phytogeographers should be 
appointed by the Vienna congress, to continue the work on a pro- 
posed code of rules. 
This committee should consider what kinds of technical terms 
are needed; how they should be classified, for example with regard 
to distribution, abundance, elevation, phenological phenomena, etc. 
The result of the work of the committee already existing, and of 
the succeeding one, should be published at an early date, so as to 
give the public ample time to discuss the various phases of the ques- 
tion, before the following congress assembles. 
STANFORD UNIVERSITY, CALIFORNIA. 
