TRANSACTIONS 
OhiT HS 
American PHILOSOPHICAL Society, &. ~ 
ia hee ; 
Conjectures concerning the Yoh fion of the Earth, rc. 
an a letter from Dr. B. Franklin, to the Abbé Soulavie. 
Pafley, September 22, 1782. 
STR, . 
Read Nov. f@ RETURN the papers with fome corrections. 
rb RES i I did not find coal mines under the Calcareous 
rock in Derby Shire. I only remarked that at the loweft 
part of that rocky mountain which was in fight, there 
were oyfter fhells mixed in the ftone; and part of the high 
county of Derby being probably as lees above the level 
of the fea, as the coal mines of Whitehaven were below 
it, feemed a proof that there had been a great bouleverfe- 
ment in the furface of that Ifland, fome,part of it having 
been deprefled under the fea, and other parts which had 
been under it being raifed above it. Such changes in the fu- 
perficial parts of the globe feemed tome unlikely to happen 
if the earth were folid to the centre, I therefore imagined 
that the internal part might be a fluid more denfe, and of 
greater {pecific gravity than any of the folids we are ac- 
quainted 
