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that fits them for Hygrometers : and to meafure and de- 
termine the different quantities of Moifiure in the Jir^ 
in different Flaces and Seafons. How freely Water paf- 
fes and carries with it terrejirial Mattery through 
tresy Colatures^ Dijlillations^ &c. hath been intimated 
already. 
8, Wat^r is not capable of performing this Office to Plant 
nnlefs affified by a due ^antity of Heat : and this mufl 
concurr or Vegetation 'will not fucceed. The Plants that 
were fet in the Glaffes Q^R. S. &c. in OBober and the 
following colder Months^ had not near the quantity of 
Water fent up into them, or fo great an additional En- 
creale by much as thofe that were fet in June, July^ and 
the hotter. 'Tis plain Water has no power of moving it 
fclf : or rifing to the vail height it does in the more tall 
and lofty Plants, So far from this, that it does not ap- 
pear from any Difcovery yet made, that even its own 
Fluidity confids in the intefline Motion of its Parts 
whatever fome otherwife very Learned and Knowing 
Perfons may have thought. There's no need of any 
thing more, for folving all the Phcenomena of Fluidity^ 
than fuch a Figure and Difpofition of the Parts, as Wa^ 
ter has. Corpufcles of that makcy and that are all abfo- 
lutely Sphericaly muft ftand fo very tickle and nicely up- 
on each other, as to be fufceptible of every impreffion : 
and, tho' not perpetually in Motion, yet mufl be ever 
ready and liable to be put into it, by any the flighteft 
Force imaginable. It is true, the Parts of Fire or Heat 
are not capable of moving themfelves any more than 
thofe of Water: but they are more fubtil, light, and 
oBivCy than thofe are, and fo more eafily put into Motion. 
In fine, 'tis evident and matter of Fadt that Heat does 
^ operate upon and move the Water, in order to its carry- 
ing on the Work of Vegetation : but how *tis agitated 
