( G ) 



in it's fcmi-diamcter, or one third of an inch in the wLolc, and in 

 this, one row or circle, and no more, of the very large veflcls, be- 

 fore defcribed, had been formed. Tlien, to difcern the difference 

 between this timber and that brou£rht from Ri^a and KoninirflierG:, 

 let US attend to Jig. 6, ABCDEF, wherein is exhibited a fmalJ 

 piece of fuch timber mit tranfverfely, and drawn from the micro- 

 fcope. 



The piece of wood which, in this figure, is reprefented by ABC, 

 or D EF, contains about the fifteenth part of an inch in length*, and 

 this length, or rather this thicknefs, the tree had acquired in two 

 years growth, fo tiiat A B denotes the thicknefs produced in the tree 

 in one year, and is about the thirtieth part of an incii in length ; B C 

 or E D, indicate the increafe of the following year ; ABC and FED 

 reprefent the larger horizontal vellels, which in 7%". 2, are explainedby 

 AB or CD ; and the dark lines HHHH, indicate the fmaller hori- 

 zontal ones, which in/g. 2, are defcribed by G G G : all tlie round 

 cavities, of which there are three dificrent fizes reprlented in this 

 figure, and which are found within the compafs of the thirtietii part 

 of an inch in length, are the three different forts of perpendicular 

 vellels before defcribed, Hence we fee that in a tree, which is 

 augmented in fize, in it's femi-diameter, one inch, or in the whole 

 diameter two inches and no more, in the growth of thirty years, 

 there will be formed thirty rov»'s, or feries of large veflels ; from 

 whence it follows, that tiie greatefl part of Oak Timber, of fuch 

 flow growth, muft be very foft and perifhable : and if on the other 

 hand we confider, that Oaks growing in a warmer climate may, in 

 one year, increafe in fize, in their lemi-diameter half an inch, or an 

 inch in their whole diameter, we may eafily perceive how large a 

 portion of wood will be forjTied in them, having only one row of the 

 large veflels in it, and how firm, folid, and durable fuch wood mufi 

 be. 



* This fize is reprefented infg.^j at X. 



