532 THE JOURNAL OF GEOLOGY. 
None of the inter-glacial wood obtained by Mr. Reid has 
appeared to belong to this species, although it is possible that 
No. I may represent it. 
ALNUS RUBRA, BONG. 
This species, the common alder of the region, is a com- 
paratively large tree with light, soft, close-grained satiny wood, 
which is light brown tinged with red in color, the sap-wood being 
nearly white. 
The specimen described above that was obtained by Miss 
Scidmore, is referred without hesitation to this species. It is so 
little changed that it might be mistaken for a recently grown 
example. 
F. H. KNOWLTON. 
U.S. Geological Survey. 
