OPEN LETTERS. 
Comment on ‘‘The meaning of tree'life.”’ 
When Professor Greene, in reviewing Professor MacMillan’s Meta- 
ticular the section last referred to, seems to have furni 
How far the terms which Professor MacMillan has found to express 
roperty $0 
. ee Life” in 
ning of Tr MacMil: 
By comparing the article entitled “The Mea 
recent issues of the Wafura/ist with the portions of 7 sor 
also w te : 
