\6o Vegetable Statifks. 



lindrical glafs yy> the young (hoots of the 

 Vine, Apple-tree, and Honey/tickle, both 

 ere&ed and inverted j but found little or no 

 air came either from branches or leaves, 

 except what air lay in the furrows, and the 

 innumerable little pores of the leaves, which 

 are plainly vifible with the microfcope. I 

 tried alfo the fingle leaf of a Vine, both by 

 immerling the leaf in the water x, and let- 

 ting the ftalk ftand out of the receiver, as 

 alfo by placing the leaf out of the receiver, 

 and the ftalk in the glafs of water*; but 

 little or no air came either way. 



I obferve in all thefe Experiments, that 

 the air enters very flowly at the back of 

 young fhoots and branches, but much more 

 freely thro' old bark : And in different kinds 

 of trees it has very different degrees of more 

 or lefs free entrance. 



I repeated the fame Experiment upon fe- 

 veral roots of trees : The air pafled moft 

 freely from n to x ; and when the glafs- vef- 

 fel^ was full of water, and there was no 

 water in x, the water pafled at the rate of 

 3 ounces in 5 minutes 5 when the upper 

 end n was cemented up, and no water in^, 

 fome air, tho' not in great plenty, would 

 enter the bark at zf> arid pafs thro' the wa- 

 ter at x. And 



