102 BOTANICAL GAZETTE [AUGUST 
writer, CONWENTz (4), agrees with this description and extends it 
to include the root. I have found the observations of both writers 
to be practically true for Pinus Sirobus and P. resinosa. In view 
of what is to follow, however, dissent must be expressed from the 
statement that during their further course the rays are separate. An 
important feature which neither writer emphasizes is that the rays 
in this young wood are low, rarely more than two cells in height. 
The further course of the rays in root, stem, and cone axis shows 
essential differences; accordingly these regions are treated separately. 
Root 
Some distance from the pith certain peculiar tracheids appear, 
which Kny and other investigators seem to have overlooked. 
Fics. 1, 
two rays; fig. 2, P. Strobus: young root; short tracheids with characteristic radial 
projections. 
2.—Fig. 1, P. resinosa: young root; short tracheids extending betwee? 
Examples of them are shown in figs. 1 and 2. They occur in radial _ a 
rows, extending between two rays which lie in the same vertical 
plane. Consequently they are of various lengths, depending on the 
distance between the rays. Their form is also variable, often belMg 
quite uniform, like tracheids (fig. 1), often very irregular in outline. — 
