( ) 
grafted on the Englifh Oak, as it keeps Cwhilft the 
Oak flieds^ its Leaves in Winter, fliews that the Sap 
does not circulate. 
CHAP. V. 
Expermsnts^ x^herehy to prove, that a great Quantity of 
Air is infpir d hy Plants, 
O UR Sagacious Author makes it appear in this 
Chapter, that Plants imbibe a great deal of Air, 
not only that v/hich comes up with the Sap from the 
Earth fthe Earth containing Air both in an elaftick and 
in a fix’d date,) but alfo take it in thro’ the old Eyes 
and Bark, efpecially at Night, when the Plants are 
in an imbibing State. 
The Experiments whereby he proves the faid AJ/ertion, 
are chiefly thefe, viz. 
I. An open, empty, Glafs-Tube fet upright, had an 
Apple-Branch cemented in its upper end, the other 
End fet in a Veflel of Water; upon which the Air 
went up into the Branch out of the Tube, as appear’d 
by the rifing of Water into the Tube. 
2. A Cylinder of Birch of about i Inch Diameter, 
with the Bark on, cemented in the middle, to the Top 
of an Air-Pump Receiver, fo as to fill up the Hole at 
the Top of the faid Receiver, had its lower End im- 
mers’d in a VefTel of Water under the Receiver, upon 
the Plate of the Air-Pump. Then in working the 
Pump, Air came out at the Bottom of the faid Cylinder, 
bubbling 
