/ 





Vegetable Staticks. 



71 



in fome meafure appear by the experiments 

 in this and the following chapter. 



I fhall begin with an experiment upon 

 roots, which nature has providently taken 

 care to cover with a very fine thick (trai- 

 ner; that nothing fhall be admitted into 

 them, but what can readily be carryed off 

 by perfpiration , vegetables having no o- 

 ther provifion for difcharging their recre- 

 ment. 



ffc- 



Experiment XXI. 



■ 



Auguft 13. In the very dry year 1723, 

 I dug down 2 -\- i feet deep to the root 

 of a thriving baking Tear-tree, and lay- 

 ed bare a root \ inch diameters. (Fig. 10.) 

 I cut off the end of the root at i, and put 

 the remaining ftump / n into the glafs tube 

 dr, which was an inch diameter and 8 inches 

 long, cementing it fait at r ; the lower part 

 of the tube d z, was 1 8 inches long, and % 

 inch diameter in bore. 



Then I turned the lower end of the tube 

 uppcrmoft, and filled it full of water, and 

 then immediately immerfed the fmall end z 



into the ciftern of mercury x ; taking away 



my 



z 



