:; 



c; 



Vegetable Statkks. 



87 



fcs to be blown of the fliapc of this here 

 defcribed (Fig. tz>) of fcvcral dimenfions 

 at r, from two to five inches diameter, with 

 a proportionably large cavity c: the ftcms 

 as near | inch diameter as could be, the 

 length of the item 16 inches. 



I cemented one of thefe glafs vcficls to 

 a large fmooth barked thriving branch of an 

 Apple-tree^ which was 12 feet long, 1 -\- + 

 inch diameter at / : I filled the glafs tube 

 with water, and immerfed the fmall end in 

 the mercury x, which rofe but 4 inches, 

 yet it imbibed water plentifully 5 but the 

 air iflued too faft out of the branch at ? f 

 for the mercury to rife high. 



* 



This, and many other experiments of this 

 kind, convince me that branches of 2, 3, 

 ©r 4 years old, are the beft adapted to draw 

 the mercury higheft : The veffels of thofe 

 that are older being too large and pervious 

 to the air, which paffes mod freely thro' 

 the bark, cfpecially at old eyes : As will be 

 more fully proved in the fifth chapter. 



Experiment XXVI. 





'July 30th at noon, a mixture of fun and 



G 4 clouds, 



1 



I 



