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Fig. 155.—An Apple Twig.
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Fig. 156.—Same twig before leaves fell.
size that they were a year ago. They are dormant. The only way
for a mature bud to grow is by making leaves for itself, for a leaf
will never stand below it again. The twig, therefore, has buds of
two ages,—those at bbbb are two seasons old, and those on the
