306 
cation save natura grafting that would account for the 
phenomenon. 
Natural grafting in its various phases holds peculiar attrac- 
tions for people interested in tree life, and the subject is well 
worthy of attention by people who have the necessary time at 
their disposal. 
EXPLANATION OF PLATES. 
1. Healed stumps of Douglas fir (Pseudotsuga Douglasit). 
2. Two trees of Douglas fir showing the connection of roots above 
ground. 
3. Naturally-grafted roots of Abies grandis. 
XXXII._THE NATURE OF CHARRED WOOD. 
L. A. Booptez. 
The pero se of organic matter by heat or by the action 
of sulphuric aci 
gestive resul 
f LN, EA OAT AP AT eI AP rectal 
