( 15 ) 



I cut longitudinally, buv in a different manner from that defcribed 

 in fig. 8 ; for as in that figure the wood is reprefented when fo Iplit 

 that the air velTels, and thoi'e fmaller ones which I call arteries, and 

 alfo the horizontal tubes of the wood, are all divided longitudinally, 

 here on the contrary the perpendicular veflels are fp^it or divided 

 longitudinally, but the horizontal ones are cut obliquely. 



Fig. 13, LMNO, reprefents fuch a particle of the wood in which 

 the horizontal veU'els may be feen placed fo clofe to each other as to 

 be only feparated by one or other of the air veflels. Thefe horizon- 

 tal velTels lying fo clofely and regularly befide each other it is no 

 wonder that this kind of wood is of all, the mod eafily fplit, and 

 Itrait in the fplitting. 



I have caufed a feparate drawing to be made of thefe horizontal 

 tubes or veflels in their pofitions adjoining to each other, in order 

 the better to diftinguifli how they lie among the perpendicular ones. 



F/^. 14, PO, reprefents thefe horizontal tubes or veflels, many 

 of which are feen in fig. i^. Thefe veflels in fome places lie twice 

 as clofe together as they do in others; and upon examining them 

 with the greateft accuracy I was able, I muft fay that I f;iw two 

 kinds of thefe horizontal veflels or tubes of the wood, one fort of 

 which was fo much fmaller than the other as almoft to efcape the 

 fight. 



For the more fully elucidating this fubjeft, and for the informa- 

 tion of any who may have the curiofity to repeat my obfervations, 

 I have in fg. 1,5, given a drawing of the manner in which I cut or 

 fplit the wood. In this figure AB C DF, reprefents the fourth part of 

 a round piece of the tree or a branch of it, of which B denotes the 

 center of the tree or branch ; at G is (hewn how the particle of wood, 

 reprefented in fg. 8, was fplit off; at C, how the particle repre- 

 fented in figures i - and 12, was cut off, and at E, how the particle 

 reprefented in fg. J3, was fplit off. 



