CHAP. IV. OF NOMENCLATURE AND TERMINOLOGY. 
533 
and endosperm contrived for the same part : testa is synony- 
mous with episperm ; putamen with endocarp : for funiculus 
umbilicalis we have trophosperm and podosperm ; and, un- 
fortunately, numerous other instances might be adduced. 
The rule to be observed in terminology is evidently this ; that 
as no word ought to have two applications or meanings, so no 
idea should be expressed by more than one term ; and, if a 
term expressive of a distinct point of structure already 
exists, no new term should on any account be created, from 
the fancy that it may be better, or more expressive, than the 
old one. To do so is not only unwise, but absolutely 
mischievous. 
M 1\1 3 
