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SYMMES’S THEORY. 
PRINTERS or Booksellers, who may be late 
In sending lor copies of Capt. Syrnmes’s Lec¬ 
ture, advertised in the Spy of the 22d inst.— 
or those who may wish a second supply, need 
not hesitate in sending at any time, as new edi¬ 
tions will go to press, should the demand justify 
it. 
Those persons who exert themselves in ob¬ 
taining copies, will be presented with one gra¬ 
tis,- not as a compensation , for it is hoped, that 
ail who think the position in the least degree 
probable, or believe that it is even worth while ' 
to inquire how the earth is constituted, will be ; 
disposed to give their aid in furthering the de- | 
Veiopement of such knowledge, without a hope 
A any other reward than that of soon or late 
realizing something new. 
The following is a sketch of the arrangement 
of proofs in the Lecture. 
1st. Mathematical proof, deduced from geo¬ 
metrical posit ons. 
2d. Proof by celestial analogy, deduced from 
Saturn and otfn r planetary bodies. 
3d. Terrestn d facts and phenomena; such 
as the migration of fishes, quadrupeds and 
fowls, to and from the polar regions—south¬ 
ward in the spring and northward in autumn. 
Also such as the Variation of the needle, the 
eculiarity of the winds and seasons high north, 
, * nd several other facts that tend to corroborate 
'he idea which be maintains, viz. That this our 
sphere (containing others) is hollow and wide¬ 
ly open at the poles, not difficult of access by 
water, and amply inhabited within. 
The author, on losing his proofs, in the Lec¬ 
ture, expresses a wish, that the United States 
would ere long be actuated by'that spirit of en¬ 
terprise for examining the unexplored parts of 
the earth, which now' pervades the Russian and 
British nations. 
Should any Printers please to give this Card 
ar insention, they may thereby contribute (to 
say tbe least of it) to the encouragemet of sci¬ 
entific enquiry or research. 
Cincinnati, April 29th, 1820. 
NOTE.—Those writing for copies are desir¬ 
ed to send their letters without sealing them, 
that they may be kno\Vn from anonymous ones, 
which are frequently sent to the author. 
