Vegetable Stanch. 87 



&s to be blown of the fhape of this here 

 defcribed (Fig. 12.) of feveral dimenfions 

 at r, from two to five inches diameter, with 

 a proportionably large cavity c : the ftem s$ 

 as near % inch diameter as could be, the 

 length of the ftem 16 inches. 



I cemented one of thefe glafs vcffels to 

 a large fmooth barked thriving branch of an 

 Apple-tree, which was 12 feet long, 1 -\- i 

 inch diameter ati; I filled the glafs tube 

 with water, and immerfed the fmali end in 

 the mercury x, which rofe but 4 inches, 

 yet it imbibed water plentifully ; but the 

 air iffued too fall out of the branch at /, 

 for the mercury to rife high. 



This, and many other experiments of this 

 kind, convince me that branches of 2, 3, 

 or 4 years old, are the bell adapted to draw 

 the mercury higheft : The vefTels of thofe 

 that are older being too large and pervious 

 to the air, which paffes moft freely thro' 

 the bark, efpecially at old eyes : As will be 

 more fully proved in the fifth chapter. 



Experiment XXVL 



July 30th at noon, a mixture of fun and 

 G 4 clouds 3 



