324 Of Vegetation. 
But when, on the other hand, the crude 
watry part of the nutriment bears too great 
a proportion to the more noble principles, 
either in a too luxuriant ftate of a plant, or 
when its roots are planted too deep, or it 
ftands in too fhady a polition, or in a very 
cold and wet fummer ; then it is found, 
that either no fruit is produced, or if there 
be any, yet it continues in a crude watry 
Hate ; and never comes to that degree of ma- 
turity, which a due proportion of the more 
noble principles would bring it to. 
Thus we find in this and every other 
part of this beautiful fcene of things, when 
wc attentively confider them, that the great 
Author of nature has admirably tempered 
the conftituent principles of natural bodies, 
in fuch due proportions as might belt fit 
them for the ftate and purpofes they were 
intended for. 
It is very plain from many of the fore- 
going Experiments and Obfervations, that 
the leaves are very ferviceable in this work 
of vegetation, by being inftrumental in bring- 
ing nourifhment from the lower parts, within 
the reach of the attraction of the growing 
fruit s which like young animals is furnifhed 
with proper inftrmnents to fuck it thence. 
But 
