34 ^ Of. Vegetation. 
If thefc Experiments on leaves were further 
purfued) there might probably be many curi- 
ous obfervations made in relation to the fhape 
of leaves : By obferving the difference of the 
progreffive and lateral motions of thefe points 
in different leaves, that were of very different 
lengths in proportion to their breadths. 
That the force of dilating fap and air, in- 
cluded in the innumerable little veficles of 
young tender fhoots and leaves, is abundant- 
ly fufficient for the extending of fhoots, and 
expanding of leaves; we have evident proof 
from the great force we find in the fap of 
the Vine, chap. 3d. and from the vaft force, 
with which infinuating moifture expanded 
the Peafe. Experiment 32. we fee the great 
power of expanding water, when heated in 
the engine to raife water by fire : And wa- 
ter with air and other adive particles in ca- 
pillary tubes, and innumerable fmall veficles, 
do doubtlefs ad with a great force, tho' ex- 
panded with no more heat than what the 
Suns warmth gives them. 
And thus we fee that nature exerts a con- 
flderable, tho’ fecret and filent power, in car- 
rying on all her produdions; which demon- 
Urates the wifdom of the Author of nature 
in giving fuch due proportion and diredion 
to 
