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content of it's length and other proportion, 

 has often been ten feet, but moftly longer, 

 in three or fckir pretty equal divifions on 

 the body of every Oak, even fometimes 

 twenty feet. 



Yet is no fuch trees altitudinal growth, 

 by means of fuch their greater horizontal, 

 obftruded. As the boughs demolifhed from 

 time to time yield the fap before employed 

 to their fubfiftence only ; to throw out thf ir 

 tops, as ufual, to a greater height annually. 



Having fpoken of fome artful means 

 to promote the circumferential growth of 

 the bodies of Oaks, by the annual addition 

 of a new outer ring of wood ; I am come 

 to offer my reafons, by what particular 

 channels within, the fame is in a great mea- 

 fure promoted ; tho' it may prove my un- 

 happinefs to differ therein, from fome prefent 

 great naturalifls ; who attribute the like to 

 the upright vefTels moflly. But which I 

 take to proceed from the trachceus infertions 

 in the body of an Oak formed like a radius 

 from the center to the outermofl parts late- 

 rally J defcribed by Dr. Grew^ by the help 

 of a microfcope j a draught of which is here , 



exhibited. 



