A COLLECTION OF INTER-GLACIAL WOOD. 531 
As stated under the macroscopic description of No. 5%, it was 
accompanied by a very thick piece of bark which agrees in every 
particular with that of the living tree. It is bright-colored and 
unchanged. 
No. 3 is undoubtedly the same as 5*. It has the medullary 
rays a little smaller and an occasional resin-duct. 
Nos. 2 and 4 do not offer differences of particular account. 
TSUGA MERTENSIANA, CARR. 
This hemlock is a large tree extending from Alaska south 
along the islands and coast of British Columbia and thence along 
the Cascade Range to southern Oregon. The wood is light, 
hard, close-grained but not strong, with bands of small thin 
summer cells and numerous prominent medullary rays. In color 
the wood is light brown, tinged with yellow, with the sap-wood 
nearly white. 
Nos. 5 and 6are referred to this species. Of No. 6 the small 
piece submitted has the thin close bark of a branch of hemlock. 
The medullary rays are two or three to six or eight (or excep- 
tionally twelve) cells high. The annual rings are clearly 
demarked ; the wood cells have a single row of rather small 
pores with perfectly circular inner pores. In radial section the 
rays appear simple, that is the walls are straight and not unevenly 
thickened as in Picea. The walls of the rays have small round 
pits. 
The thin bark (No. 5) described above belongs with little 
doubt to this species, and I have so regarded it, but in absence 
of samples of the wood for comparison it cannot be positively 
stated. 
CHAMAECYPARIS NUTKZENSIS, SPACH. 
The yellow cypress, yellow cedar or Sitka cypress is also a 
large tree ranging from Sitka south through the Coast Ranges to 
Oregon. The wood is light, brittle, very close-grained and 
possesses an agreeable resinous odor. In color the wood is 
bright, light clear yellow, with thin nearly white sap-wood. 
