1888. ] BOTANICAL GAZETTE, 283 
examined. This is their eccentric or one-sided origin and 
growth. In this respect the species seems to stand quite 
alone. The specimens examined in the summer of 1887 
were taken from trees of various ages and places of growth, 
all of them were under cultivation and all in the vicinity of 
Philadelphia, except those trom the Arnold arboretum. In 
the summer of 1888, examples were obtained from trees of 
different ages growing wild near Woodbury, N. J. Th 
results obtained from these, while confirming in most respects 
those obtained from the specimens of the previous year, were 
much more satisfactory, as the young tree in its early stages, 
up to those of fifteen years old, could be observed under 
natural conditions. The wings of the lateral branches appear 
always on the upper side, running along between the leaves, 
two, three and sometimes four in number. They generally 
stand at such an angle as to form troughs along the entire 
length of the branches. These are, of course, interrupted 
at the nodes by the leaf-petioles, but they slope gradually 
ey 
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is often produced. 
by deep ridges and furrows along that part free from branches, 
The fi riderm formation occurs early 
age agange nodes of the 
year's growth are covered only by epidermis. The phello- 
able numbers. On the lateral branches at 
beginning of the cork wings, they are muc 
developed and somewhat more numerous on 
GF is developed around the stem with lenticels connecting 
€rind cells with the outer air. After a ume, a ong es 
upper side of the older internodes of this years seg This 
noticed an increase in the tissue around the lenuce ro 
may be easily identified by the naked eye as cork tissu 
