TO CORRESPONDENTS, v! CURE M6 bp 
Mr. Starx's Remarks on Dr. Reave's Paper on Refraction, and Mr. Bussy's Ac” 
count of an Improved Principle of Motion, are unavoidably postponed for want o 
room till next Number.—Mr. Lrxson’s Description of ax Appendage to Torrt’s Blow- 
pipe (transmitted through Mr. Joun Murray), and Answers by Mr. Gavin INGLIS tq. 
Questions addressed to Naturalists, came too late for insertion in this Number, but will 
appear in our next.—A Description of an Apparatus for restoring the Action of the 
Lungs, invented by Mr, Joxn Moore jun., has been received. ; e 
This day is published, Price 1s. To be continued every Saturday, 
: . Numer l.of - es 
HE FOCUS of PHILOSUPHY, SCIENCE, and ART. Wherein _ 
_ will be concentrated all the most valuable practical Information found 
dispersed through the wide range of our multifarious Journals: as well — 
as occasional Selections from the best foreign Authorities.—Neither Zeal, 
Expense nor Industry will be wanting to render the Focus an interesting , 
Treasure to its Patrons, _ } Pree Mie alin ae 
Published, for the Proprietors, by John Miller; 69, Fleet Street, and sold 
_ by all other Booksellers, Newsmen, &c. oe 
.. ON: THE LIVER AND BILIARY SYSTEM. = 
ACTS and OBSERVATIONS on LIVER COMPLAINTS, and 
“ those various, extensive, and often complicated Disorders of the Cons 
stitution originating from this source ; depicting the causes which lead to 
a morbid condition of the Digestive, Internal Organs, and Nervous Sy- 
stem: practical remarks on the different properties of the Biliary and ~ 
Gastric Secretions, and upon other important points essential to Health ¢ 
with an Appendix of Cases illustrative ofthe Principles of Treatment ;_ 
addressed equally to the Invalid as to those*of the Profession. = 
The Fourth Edition considerably Enlarged, Price 9s, i 
By JOHN FAITHHORN, M.D. “0 eR 
London: Printed for Longman and Co. PaternosterRow: Sold also by 
Constable, Edinburgh : Duncan, Glasgow ; Hodges, Dublin: and Fagg, © 
Swansea. 
Gas 
ASTRONOMICAL LECTURES DURING THE CHRISTMAS © 
Ae ale VACATION «ito ./.0% lata iad 7 oe 
M R. GOODACRE respectfully announces to the Ladies and Gen- 
tlemen of the Metropolis, that he has engaged the New THeatre 
Royat in the Haymarger, in which he purposes to deliver Astronomical 
Lectures during the month of January. It will be opened (probably on 
New Year’s Day) with a Probationary Lecture ; during which his Plan 
_ will be stated, and Specimens of his numerous Instruments and Diagrams 
exhibited, The receipts of the first night will be appropriated to some 
* charitable Institution, The Lectures will be of two different classes ;. 
During two Evenings in each Week, a Course beginning with first.Princi-, 
ples, and ascending gradually through all the different Phenomena of the 
Universe, will be delivered : during two other Evenings each Week the) 
Lectures will embrace a general view of the Science, and each, though in 
‘some respects varied from any other, wiil be complete in itself, The Tes. 
timonials of Ministers and other Persons of eminence who know Mr. Goods 
acre, and have attended his Lectures, are left with Mr. Francis Westley, 
10, Stationers’ Court, Paternoster-Row. Terms and other Particulars, 
will be announced in the Daily Papers, and in the Magazines of the next 
Standard Hill, near Nottingham, Dec. Ist, 1821. : Le Sn ae 
ry 
. ) 
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