20 



By outer bark, then, I mean not only the 

 transverse, but also a part, less or more, of 

 the longitudinal, except that very thin,* 

 smooth part next the wood, which remains 

 entire when the trees burst their bark. 



Whether the longitudinal is all one bark, 

 or more, I have not made it my study to 

 determine : but a separation or division can 

 very easily be made, and is frequently made 

 by nature. I have, however, to avoid cir- 

 cumlocution, been under the necessity of 

 dividing it into two, which I have distin- 

 guished by inner and inmost. 



By inner bark I mean less or more of the 

 longitudinal, except the inmost, by which 

 I mean that very thin smooth part next the 

 wood, which remains entire when the trees 

 burst their barks, either by nature, or when 



