163 
its leaf and recurved over the terminal scar, the bud itself giving 
evidence of this curvature. The appressed nature of the remain- 
ing buds is also worthy of note. 
It has already been remarked here several times that the lower 
branches of trees seem to be more vigorous and frequently are still 
growing when all the upper branches have already cast off their 
tips. In the case of Celtis occidentalis this found expression in an- 
other way. A number of trees were found early in August, on the 
* Germantown road, on the way to the Soldiers’ Home, which had 
lost all the tips of this year’s normally produced branches. But 
in the case of many of the lower branches the uppermost scaly bud 
had not waited till next year for its development, but had renewed 
growth during the same season. In August the tips of even this 
second crop of branches had been already cast off in many cases. 
But here and there the tips were still attached, though turning yel- 
low in color and giving evidence of the location of the future 
plane of separation. The tips included only a few nodes, and 
were 4-6 mm. long. 
Morus rubra (Fig. 4) has well developed terminal scars, with a 
depressed central portion. The milky juice of the bark will also 
serve to distinguish the species when the leaves are gone. In 
winter the twigs of Zila have a similar appearance, but its 
terminal scar has no depressed centre. 
loxylon pomiferum (Fig. 1) was found during the first days of 
August to have: cast the tips of all the more mature branches. 
But where the hedges had been cut and a fresh crop of branches 
had appeared many branches were still growing, and the tips were 
therefore vigorous. Later in the year this younger crop of 
branches also lost its tips. In the more mature trees all the 
branches had lost their tips in September. 
Platanus occidentalis (Fig. 9) is one of the more interesting 
of trees which shed the tips of their branches, owing to the 
fact that the lower part of the connate stipules forms a sheath em- 
bracing the stem, That portion of the tip which is destined to fall 
off, ceases growth quite soon and withers; being surrounded by the 
sheath of the stipules, it may be either entirely included within the 
same or it may project a little from the sheath (Fig. A). After 
a time both the tip of the branch and the surrounding stipular 
