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NOTICES OF BOOKS. 91 
as are monccious peer dicecious — with the additional advantage 
that every flower is able to produc 
The following stick contains a brilliant elucid: ation of the raison 
between them may perhaps be in some degree beneficial ; but it is not 
probable that it would be nearly so beneficial as a cross between 
owers on distinct trees, as we may infer from the inefficiency of 
great, a - 
they may be seen flying from tree to tree more frequently han might 
have been expected. Nevertheless, if we consider how numerous are 
the flowers, for instance, on a horse-chestnut or lime-tree, 
fl 
ee one or two of the several flowers on the same ers produce a 
ing flowers were ; cross-fertilise Of the lower Punic produced by 
a great tree, it is almost certain that a large number would be seli- 
eines ead if we assume that tlie tree riches only 500 flowers, 
d that this number of seeds were requisite to keep up the stock, so 
that = least one seedling should hereafter struggle to ayes f then 
e proportion of the seedlings would necessarily be derived from 
self-fortlisnd seeds, But if the tree annually produced 50, 000 flowers, 
of which the self-fertilised dropped off chaise Lerma seeds, then the 
the stock, and most of the seedlings would ‘be vigorous "frou being the 
product of a cross between distinct individ manner the 
production of a vast number of flo es serving to entice 
b 
vantage to the sieatiie : and when we behold our orchard trees covered 
with a white sheet of bloom in ie 8 spring, we should not falsely oe 
Nature of wasteful soa enditure, though comparatively little 
produced in the autum 
And here it ay be intel Why is it that t so little has been dane 
appli of a mere convenience in viaidnslaiaces coupled with 
that eons glory of a mess generous and utterly disinterested 
