On the Strata of Mountains. 367 
Reference to the Description of Mr.H.B. Way’s Method of 
procuring Turpentine from Fir Trees. Pl. VIII, Fig. 4. 
a, Represents the lower part of a fir tree, as growing in 
the earth; J, shows the part where a portion of the bark is 
taken off to assist the emission of the turpentine; ¢, is a 
hollow cut within the body of the tree, it is in ihe form of 
a bason at the lower part to receive the turpentine, which 
exsudes into it from the pores of the tree. this bason is 
about six inches froin the ground. 
LXill. On the Strata of Mountains. By Wi.1am 
Ricsarpson, D.D, 
To Mr. Tilloch. 
Sir, Berwren two and three years ago, a friend trans- 
mitted to me from London a Number of ‘your Philosophical 
Magazine, containing a paper from Mr. Farry, in which 
he is pleased to speak in most flattering terms of a memoir 
ef mine, published in’ the Philosophical Transactions for 
the year 1808. le in eepe 
The subject was the atrangement’ of ‘the strata in the 
country where [ lived, with the entite removals of vast por- 
tions of them, showing the: terminations of the strata left 
behind, often abrupt, and sometimes forming a perpendi- 
cular tacade, where the abrupting agent'acted on an accu- 
mulation of strata. bi Wit 
Mr. Farey exultsthat a gentiemair who had never met 
with bis observations‘onm' the strata ‘of Bngland, nor read bis 
publications on their subjects shouldfind that the strata in 
Ireland had the same operations* performed upon them ; 
sometimes partial abruptions, sothetimes entire removal of 
vast portions of these strata, without leaving a trace behind 
to aid our conjectures ‘in discovering what was become of 
such vast portions of niatter, 
Mr. Farey speculates upon the agent that performed these 
mighty operations: [do not presume to venture so far. L 
Timit myself to facts, from which those who choose to avail 
themselves of my data, may draw such inferences as they 
think can be sustained. 
Cosmogonists, who by their respective theories pretend 
to lay open original formation, carry their views too far 
back, and overlook a most important step in the discussion, 
that is, the actual arrangement of our materials, however 
originally formed. 
sain 
Euu- 
