SYM}I£S’S theory of tiie faK 11 ‘ 
From the Petersburg Intelligencer. 
A writer in the Kentucky Herald, un- 
ifr^noV loUe^e magnitude of 
th f e fl ea fmX to be created, and put into 
0 t fluid mat - as t | ia t of our 
^^rS ; =Ui,«tot. i elaw S of S ra- 
V 
for 
points 
"Although we are not believers m the 
theory of Capt. Symmes, yet we have the 
best authority to show, not only that tne 
writer in the Kentucky Herald is mista¬ 
ken, but that the theory of Capt Symmes 
is plausible, and agreeable to the establish¬ 
ed laws of gravitation. I he celebrated 
M'Laurin, in the fourteenth chapter of his 
second volume of Fluxions, investigates 
at considerable length the theory of Capt. 
!'Symmes, then known as the ingenious the¬ 
ory of Dr. Halley ; and he concludes the 
result of his investigation iri the. following 
words: “And hence there seems to be 1 
some foundation for proposing it as a query, 
whether the internal constitution of the 1 
parts of the earth above mentioned, that 
was proposed by Dr. Halley, will not be 
found to account, in a probable manner, 
for the increase of gravitation ; and at the 
same time of the degrees of the meredian 
from the equator to the poles; as these 
have been determined by the best obser¬ 
vations hitherto.” 
He also adds, “ When more degrees 
shall be measured accurately on the me¬ 
ridian, and the increase of gravitation 
from the equator towards the poles deter¬ 
mined by a series of many exact observa¬ 
tions, the various hypothesis that may be 
nnagined concerning the internal consti¬ 
tution of the earth, may be examined witji 
more cei , ta-mtY. ,> -- 
