On these subscription papers, former sub¬ 
scribers are invited to commute the whole or a 
part of their previous subscriptions, for one or 
more of those copies which are to be enlarged 
With an appendix, where they prefer so to do. 
The publication of the Lecture will be defer¬ 
red a little longer than at first intended, in or¬ 
der to afford time for the subscription papers 
on the enlarged plan to obtain circulation and 
signatures. 
Those persons who feel disposed to aid in 
giving the Theory an extensive circulation 1 by 
the distribution of a multitude of impressions, 
will of course subscribe for the lesser copies, 
containing the Lecture, merely—with a f«w 
marginal notes : and such as wish to possess the 
author’s ideas, and authorities, in a more per¬ 
manent and ample form, will put down their 
names for the larger pamphlets,—which instead 
of being placed like the others at the original 
cost, will be offered at about the usual price of 
publications of a similar size. 
Those Printers exchanging papers with the 
Spy and such other printers as shall be furnish¬ 
ed with a copy of this advertisement, who will 
obtain subscribers according to the prices and 
terms herein stated, and write to the author on 
the subject, shall receive by the mail, the num¬ 
ber they may obtain subscribers for or as many 
as they may wisli sent as a venture, so far as the 
impression goes, tand the type will probably be 
kept in form some time,) for which they "can 
make such return by mail, as the proceeds may 
justify, after reserving all expences, including 
their own and the booksellers per centage, anS- 
any editor or bookseller in any other city or 
town, in the U. States or Canada, not included 
in this list, who will interest themselves in the 
same way, shall be supplied in like manner. 
Should there be no nett proceeds to return, i 
yet th« main object of the author will be ob¬ 
tained, which is, a wide circulation of his sys¬ 
tem in a way, somewhat more permanent than 
newspapers commonly afford. Should the au¬ 
thor lose at one place, he may hope to gain 
enough at another, to ‘make both ends meet 9 
Cincinnati, April 22d, 1820. 
NOTE. The length of the Lecture is such, 
as to have occupied about one hour in the de¬ 
livery, independent cf the Notes. 
Should any Printers please to give this Card 
an insention, they may thereby contribute (to 
say the least of it) to the encouragemet of sci¬ 
entific enquiry or research. 
