* 
et Rae eae = ey ; 647 migege y ati 
temperature oj " of the ear 125 
sie aa hal ‘cle hatin cases, a very 1 ace 
produce the phenomena. "thtigdey xe: 
“elt t wi iwi ee antued that this seteuss if it be. real, is necessa- 
rily connected with the whole contraction which the globe un- 
dergoes from the effect of secular ne It furnis ee a basis 
for calculating the very weak influence which this fate contrac- 
tion exercises in accelerating the velocity of rotatio 
“ Nothing less than this enormous power which; I have de- 
scribed, is required to raise laya. In the agente cr where 
lavas come from a Lineee of twenty leagues, it is 
ity, that they would be pres with 
equal to renty tight abel atmospheres. We know 
a force 
oniees that they overflow after an eruption of oe amet 
mometric, which I propose in explanation of volcanic phenom- 
ena; and to shew how well it applies to all their details, It will 
centers, ancient and arte point out the thinnest and least re- 
sisting portions of this cru 
“In my preceding Bir I have left uncalculated the e gase- 
ous matters which are produced at each eruption; for supposing 
them reduced to their primitive state of liquidity while in the 
mixture from whence they have been disengaged, oho fees 
occupy, but little bulk; and the oaalent I have adopted, of 
bic mere teesh is much ‘beyond the actual volume of peced lava.” 
The neppanitions of M. Cordier in this paragraph seem too 
Bor oF s. We have as ye nothing that ail to 
ite heres the gneiss int, a reposes,) beat fom ty “2 
sixty miles thick, No accurate measure of their edges and 
a lava should require ‘for its ejec ction the force o twenty- 
eee thousand ergeahegs: is neither probable from any 
