34 



VEGETABLE SUBSTANCES. 



the imgs of the bo^-myrtle {Myrica Gale). After 

 these, the peat becomes of a verj spong^y nature, and 

 contains no vegetable substance of larger dimensions 

 than the stem of a heath, and not verj' oflen that. 

 The smaller portions of peat which lie in dells, in 

 countries not much elevated, contain in general only 

 the twigs and the nuts of hazel. The fall of timber 

 is not, however, essential to the formation of peat 

 bogs, for, in many of them, the remains of trees have 

 not been found. 



■>¥mM'.''^ 



:m M 



Scotch Fir. — Pinus sylvestris. 



The pines found native in Britain, whether buried 

 in the earth, or growing on its surface, are all of one 

 species, — the Phius sylvestris, or wild pine — in this 

 country usually termed the Scotch fir. This pine is 

 very generally diffused. It is found in all the northern 

 regions, and in elevated ones considerably to the 

 .south. The timber which it produces is called red 

 deal, or yellow deal, according to the colour ; and as 

 deals are the form in which it is often conveniently im- 



