lol^S 
American Association for the Advancement of Science. 
TITLE OF COMMUNICATION. 
Title No. . Section 
Beceived by the Permanent Secretary^ .187 
Abstract of the paper here recorded, received by the Permanent Secretary, 
on.187 . 
I propose to present the follovying communication at the 
next meeting of the Association, which, if accei>ted, and the 
Sectional Committee can so arrange, I should like to have on 
the programme for the.day of the meeting. 
It will occupy about.minutes. 
Missouri Botanical GA-toHN 
George Engelm-' rb\F’-:d3 
.' , . Botanical 
cm copyright reserved garden 
