120 =- Analysis, G-c. of Cordier’s Essay upon the 
“ 8. If the crust of the earth has really been thus formed, the 
primitive strata, known to us, ought to be disposed nearly in the 
order of their fusibility.. I say nearly, for it ought to have some 
effect on the rapid action with which the process of cooling took 
place at its commmgarament and of the action also of chemical 
affinities operating. on uch immense masses 
“© 9, Hence, the mean thickness of the crust of the earth does 
not exceed twenty leagues of five thousand metres, (about sixty- 
two miles En glish.) 1 would even say, Sage according to some 
fature occasion return, the mean ee is muc 
earth. It would be but the four-bundsestth ae ht the ascertain- 
ed length of a meridian.” 
Pallas somewhere Caicaitad the mich dd of the e prim- 
itive formations at twenty-one miles. In travelling along the 
main rom Richmond to. Charlottesville, in Firginis 
the reviewer of this paper and Mr. Vanuxem noted, as well 
as we could, the distances at which the strata changed; from 
the granite at Richmond, to the disappearance of the primi- 
tive ; and we thought t the primitive strata, thus passed over, 
could not be less in thickness than forty miles, cain the 
usual allowance in calculation. 
“ 10. It is probable that the thickness of the crust of the earth 
is very unequal. This seems to follow from the increase of sub- 
terranean temperature from one country to another. Differ- 
ence of conducting power, is not alone sufficient to account for 
the fact. Several ee data tend also to the same conclu- 
disengaged, being the. fandamental element of the cli- 
mate neh that locality (?)—and .as in our tit epiaton; M ier’s) 
between ‘one country and another, we may conceive how, ceteris’ 
paribus, countries in the same latitude may have different. cli- 
mates; and how Mairan, Lambert, Mayer, and other philoso- 
Pp 
have o- obitelbienies ere a new caus narnae addition 
which occasion the singular inflexions exhibited by iother- 
