11 
The PREFACE. 
'7hey have given us very accurate and faithful 
accounts of the JlruSiure of the parts-^ which 
they carefully traced^ from their firfi minute 
origin^ the feminal TlantSj to their full growth 
and maturity ythfd their Roots ^ Trunks Bark^ 
Branches j Gems, Shoots, Leaves, Bloffoms 
and Fruit, In all which they obferved an exalt 
and regular fymetrj of Farts mojt curioufy 
wrought in fuch manner, that the great work 
of Vegetation might effeEiually be carried on, 
by the uniform co-operation of the feveral 
Farts, according to the different offices affign^ 
ed them by nature. 
Had they fortuned to have fallen into this 
fat teal way of inquiry, perfons of their great 
application and fagacity had doubt lefs made 
confiderable advances in the knowledge of the 
nature of Flants. This is the only fure way 
to me a fure the feveral quantities of nouripj- 
ment, which Flants imbibe andperfpire, and 
thereby to fee what influence the different ftates 
of Air have on them. This is the like lie fi me- 
thod to find out the Safs velocity, and the 
force with which it is imbibed: As alfo to 
eftimate the great power that nature exerts 
in extending and pujhing forth her produbUons, 
by the expanfion of the Sap. 
About 
