REVIEW. 
83 
Example of a primary shoot a, and a secondary shoot b. The former is seated 
on the alburnum of the first year, the latter on that of the third. 
12 
' a 
12 
The following delineation represents the disposition of the layers 
of the wood and hark, with the 
places of the primary and second¬ 
ary huds or shoots, on a section of 
an abbreviated stem of a tree of 
three years’ growth. 
This figure shows, that the la¬ 
teral shoots d, d, d, d, and new 
layers of wood, b, b, on the lower 
part of the stem of the present 
year, are not attached to each 
other; and that the growth of the 
former can only affect that of the 
latter indirectly; nor can they 
(the shoots d, d, d, d, except the 
leading one e,) he supposed to as¬ 
sist the formation of the new zone 
of wood by ejecting fibres down in¬ 
to it; because their fibrous attach¬ 
ment is upon the alburnum, as at 
e, <?, Fig. 5; that is, upon that 
division of the envelope which was 
formed into alburnum in the pre¬ 
vious year. The young shoots 
which are elongated and bear the 
foliage of deciduous trees, are 
pretty regularly studded with buds 
along their whole length, though 
only a small number of them are 
developed in succeeding years. 
A few at the point always burst, 
namely, the leader and two or 
three laterals, part of the latter 
a 3 
1831, 1830,1820. 
