3°4 
Mr. Knight on the inverted Action , &c. 
I send you two specimens of the fir wood I have described, 
the one having been taken off above, and the other below, 
the decorticated space. The bark of the latter kind scarcely 
exceeded one-tenth of a line in thickness ; the cause of which 
I propose to endeavour to explain in a future communication 
relative to the reproduction of bark. 
I am, &c. 
T. A. KNIGHT. 
