The Rev. P. Keiru on the Origin of Buds. 429 
in the lip, and sprung from buds, which, if not formed by, were 
yet conveyed to, and deposited in, the alburnum through the 
medium or agency of the proper juice, without having ever been 
connected with the pith or central layers of the incipient stem, 
and without having been annually protruded towards the cir- 
cumference through each successive layer of wood. 
Thus the doctrine of Du Hamel and of Knight is established 
indisputably, at least to a certain degree, and corroborated by a 
new and irrefragable proof ; whilst the deductions of the writer 
who combats it have been shown to possess less of the character 
of universality than we find to be claimed for them, and to rest 
upon an induction of particulars rather too limited in its extent. 
Particularly it has been shown by the above facts, that “an ad- 
ventitious bud, or bud appearing on an old stem or branch," 
does not always ** originate in a germ generated at the develop- 
ment of the stem or branch on which it appears," and that a 
" plant may contain latent germs besides those which are annually 
carried outwards in a horizontal direction. 
- If it be said that the central origin of the bud, deneihie with 
its horizontal protrusion, is the rule, the position will readily be 
admitted, at least with regard to the subjects already examined, 
and perhaps with regard to others also. Yet it is quite as 
important to know the exception, as to know the rule itself; 
because exceptions are the means which Nature has recourse to 
in extraordinary cases. It may be but seldom that buds are 
protruded in the way I have now stated, or that the shoots 
issuing from them are augmented into branches of any great 
importance. But the same thing may be said of buds issuing - 
from the surface of a large trunk, even after having finished their 
horizontal course. They seldom attain to any great size, unless 
the stem is truncated, when the others would doubtless do the 
same ; and it is those shoots only that are protruded in the first 
year 
