Vegetable Staticks. 85 



contrived other means, moft powerfully to 

 raife and keep in motion the fap, as will in 

 fome meafure appear by the experiments in 

 this and the following chapter. 



I (hall begin with an experiment upon roots, 

 which nature has providently taken care to 

 cover with a very fine thick {trainer ; that 

 nothing (hall be admitted into them, but what 

 can readily be carried off by perfpiration, vege- 

 tables having no other provifion for difcharg- 

 ing; their recrement. 



Experiment XXI. 



Auguft 13. in the very dry year 1723, 

 I dug down 2+| feet deep to the root 

 of a thriving baking Pear-tree, and laid 

 bare a root 4 inch diameter n (Fig. 10.) I 

 cut off the end of the root at /, and put 

 the remaining flump i n into the glafs tube 

 dr y which was 1 inch diameter, and 8 inches 

 long, cementing it fan: at r; the lower part 

 of the tube d z was 18 inches long, and i 

 inch diameter in bore. 



Then I turned the lower end of the tube 

 z uppermoft, and filled it full of water, and 

 then immediately immerfed the fmall end z 

 into the cittern of mercury x ; taking away 



G 3 my 



