152 . Vegetable Staticks. 
I then inverted the hick, placing n fix •in- 
ches deep in the water, and covered all the 
bark from the fur face of the water to z 
the top of the receiver with cement ; then 
pumping the air which entered at the top of 
the hick, paffed thro* the immerfed part of 
the bark : When I ceafed pumping for fome 
time, and the air had ceafed ilfuing out; 
upon my repeating the pumping it would 
again iffuc out. 
I found the fame event in Birch and 
Mulberry fiicks, in both which it iffued moft 
plentifully at old eyes, as if they were the 
chief breathing places for trees. 
And Dr. Grm’obferves, that the pores 
are fo very large in the trunks of fome 
plants, as in the better fort of thick walk- 
ing canes, that they are vifible to a good 
eye, without a glafs; but with a glafs the 
‘‘ cane feems ' as if it were ftuck top full 
of holes, with great pins, being fo large 
as very well to refemble the pores of the 
skin, in the end of the fingers and ball 
of the hand. 
‘‘ In the leaves of Pine they are like- 
wife, through a glafs, a very elegant fhew, 
fianding all moft exadly in rank and file, 
thro* 
