1904] JEFFREY—A FOSSIL SEQUOIA 323 
living Sequoias are not found in the present species.? On the left of 
the figure may be seen a medullary ray. The cells are obviously very 
long, and in the present instance extend across a complete annual 
ring. The elements still retain their dark granular contents, the 
so-called resin globules. In the present species of Sequoia the _ 
resinous material is mainly found in the medullary rays and scarcely 
at all in the wood, in this respect presenting a marked resemblance to 
Tsuga and Abies among the Abietineae. There is, however, a cer- 
fain number of resin cells on the outer face of the summer wood. 
One of these elements is shown in the second annual ring and on the 
right of the figure, This feature, too, finds a parallel in Tsuga among - 
the Abictineae. 
Fig. 3 shows part of a tangential section of the wood of our 
species, under low magnification. The irregular dark striping of 
the center of the figure represents the summer wood, while the light- 
colored lateral portions correspond to the spring wood. Most of the 
medullary Tays appearing in the figure are so small as to be scarcely 
cemnible, but some of them are enormously enlarged to constitute 
orm rays, which contain horizontal resin canals. Most of these 
canals appear to be empty, but some are obviously filled with coarsely 
sranular contents, The appearance presented in the section shown 
ip fig. 3 is somewhat exceptional for the species under discussion. 
=i a tangential section of the wood reveals no fusiform 
** 4nd no horizontal resin canals. 
in ‘ '§- 4 appears to afford an explanation of the peculiarities seen 
§ 3. The magnification in this instance is not great, and as a 
pequence a large number of annual rings are present. These 
“a arched and suffer interruption toward ‘the lower part of 
2 gp In this case we have obviously to do with a healing 
inka Ng interruption in the continuity of the annual rings 
BD the rin op at which the injury took place, and outside this 
in Seg of growth are unusually thick, as is ordinarily the case 
ti aes There is a reaction farther out and the rings 
still nies nner, again to increase their thickness once more 
: - From the right border of the wound a horizontal 
i. si P., Generic characters of North American Taxaceae and 
» NOY. Soc. Canada 2: 1896 
