ADVERTISEMENT. 
EARLY seventeen years have elapsed since. the Parrosopuicaw 
Journa was commenced by Mr. Nicuoxson,Jand sixteen since the aps 
pearance of the first Number of the Puitosopuicay Macazine. | 
During this period the sciences and arts have made the most rapid pros 
ress. Numerous Philosophical and Mechanical Instruments and Machines 
have been invented and improved :—the theory and practice of Astronomy 
Kas been greatly advanced :—new Plancts have been discovered, and the 
structure of the Sun more clearly ascertained. “The Rays of Light have 
been subjected. to new experiments, which have demonstrated their sepa-. 
rate and distinct powers of illuminating and of heating; and that won- 
derful property: upen, which the pete of the Island Crystal de- 
end, but which is iow known. to 
v RLS cit Geet 
The es ihical Journal will henceforthbe discontinued; and The 
the Editors, and the Communication 
can afford. meen Ri) ote ey. Pes 
Mr. Nicuorson, therefore, requests from his Readers a continu: 
that interco.rse with which he has so long been gratified ; and that the 
patrons of the Philosophical Journal will pie their orders for the Philoso- 
phical Magazine, through the medium of their own Booksellers, as usual, 
en; but with every attention to 8. 
Communications addressed to the Editors, Picket Place, Temple Bars — 
' will meet with due attention. 
£Londim, Dec, Bt, 181% 
Se 
