165 
The preceding list includes 23 genera in which the cast- 
ing off of the tips has been noted with certainty. The list is 
by no means complete for the northeastern United States, but in- 
cludes chiefly such plants as the writer could find growing near 
Dayton, Ohio, and use for the purposes of illustration. They cer- 
tainly indicate that the method of securing determinate growth by 
the casting off of the tips of branches (usually early in the summer, 
and quite generally before the first of August) is a fairly common 
and normal one, and as such is worthy of mention in discussions 
of the habits of trees. 
One of the most interesting features about the growth of trees 
is the shortness of the period of development of the twigs of the 
year. The winter months at Bainbridge, in Georgia, have been 
unusually severe this year (1893), so that the vegetation was de- 
cidedly backward. At the beginning of March very few leaves 
had made their appearance on trees. At the close of this month 
quite a number had already developed their terminal scaly buds, 
or had begun to cast off the tips of their branches. In some cases 
the terminal buds were seen in but little more than two weeks 
after the leaves began to appear. The following notes were taken 
at the end of March: 4sculus Pavia had well formed terminal 
buds; the exterior pair of scales of these buds show a leaf-like tip 
at first, but this falls off at an early date at a scar having about 
the level of the top of the bud at this time. Careful search for 
terminal scars did not reveal any which could not be referred to 
the casting off of flower peduncles after the period of flowering. 
“4. glabra is probably in the same case, and it is equally likely 
that the supposed terminal scars of sculus Hippocastanum are 
caused by the falling off of flower peduncles, although I was try- 
ing to guard against this error at the time the first part of this 
paper was written. 
Enonymus Americanus in one case had dao the inter- 
nodes Of the scaly bud so much as to elevate the innermost scales 
120 mm. above the base of the former winter bud. The leafy por- 
tion was 300 mm. long and consisted of 6 pairs of leaves. The 
terminal bud was already formed. Acer saccharinum, Hamamelis 
Virginica, Cornus florida and Viburnum prunifolium had already ter- | 
minal scaly buds. The less vigorous branches of /uglans nigra 
