386 Jeffrey. — The Wound Reactions of Br achy phy Hum. 
parenchyma cells, but also by septate tracheids, such as have been described 
by Penhallow and Conwentz in the case of the normal and traumatic resin- 
canals of living and fossil species of Pinus and other Abietineous genera, as 
well as in the traumatic resin-canals of Sequoia. Photograph 10, Plate 
XXVII, shows a double row of traumatic resin-canals in another specimen 
of the wood of Br achy phy Hum from Kreischerville, Staten Island, which was 
not charred in any way, and is consequently much less well preserved than is 
the case with the material in the foregoing photographs. The specimen 
in question is of some interest however, since it shows a double row of 
traumatic resin-canals in the same annual ring. This feature appears to be 
rare, although not infrequently rows of traumatic canals occur in successive, 
although not consecutive, annual rings. In none of the material which has 
been gathered have horizontal canals been found, connecting the rows of 
vertical ones, such as are present in the genus Cedrus among the Abietineae 
(Comp. Anat. and Phylog. of the Coniferales, 2 ; The Abietineae, Bost. Soc. 
Nat. Hist. Memoirs, vol. vi, No. I), and in a fossil Sequoia (A fossil 
Sequoia from the Sierra Nevada, Bot. Gazette, 38, 321-332, Nov., 1904). 
The traumatic phenomena described in the foregoing paragraphs were 
found in fragments of lignite which, by comparison with the woody tissues 
of associated, well preserved branches of Br achy phy llum macrocarpum , were 
inferred to be portions of the wood of this or an allied species. It has, how- 
ever, fortunately not been necessary to rest the case on inference alone. On 
sectioning one well preserved, partially carbonized branch oiB. macrocarpum , 
Newberry, it was found that it had suffered injury, and that a large amount 
of traumatic parenchyma was present in the wood, in some cases enclosing 
traumatic resin-canals. The small size of the branch and the limited 
amount of woody tissue are doubtless responsible for the fact that the trau- 
matic canals were not more abundant, since similar conditions are present 
in small wounded branches of the living Abietineae. Photograph 11, 
Plate XXVII, shows a general view of the central portion of a transverse 
section of the specimen of Br achy phy llum just mentioned. The fibro- 
vascular bundles on account of the youth and small size of the branch 
are still separate from each other, and have not become united into 
a continuous woody cylinder as in older stems of this genus. A paren- 
chymatous stripe can be seen running through the outer half of the wood in 
most of the bundles shown in the photograph. This stripe in the case of 
a large bundle near the centre of the photograph encloses two resin-canals. 
Photograph 12, Plate XXVII, shows this bundle more highly magni- 
fied. On the left is a resin-duct surrounded by a layer of dark parenchyma, 
which has very largely collapsed. Farther to the right is another resin- 
canal less perfectly preserved. The two canals are situated in the paren- 
chymatous stripe of traumatic tissue, which crosses the wood tangentially. 
It is thus apparent that traumatic resin-canals of the same type, as are 
