ADVERTISEMENT. 



JN EARLY seventeen years have elapsed since the FhilcSophicA 

 Journal vv-as commenced by Mr. Nicholson, and sixteen since the ap 

 pearance of the first Number of the Philosophical Magazine. 



Dining this period the sciences and arts have made the most rapid pro 



fress. Numerous Philosophical and Mechanical Instruments and Machines 

 ave been invented and improved :• — the theory and practice of Astronomy 

 has been greatly advanced: — new Planets have been discovered, and the 

 structure of the Sun more clearly ascertained. The Rays of Light have 

 been subjected to new experiments, vhich have demonstrated their sepa- 

 rate and distinct powers of illuminating and of heating; and that won- 

 derful property upon which the phenomena of the Island Crystal de- 

 pend, but which is now known to be inherent in both kinds of rays, and 

 universally operative in all the cases of Reflection and Retraction. Che- 

 mistry has a second time, within the above period, kecorne a new Science. 

 < — by the discovery of the effects of Galvanism upon its processes, and 

 the development of elementary substances of higher simplicity than were 

 before known ; — by the definite proportions of the component parts of 

 bodies ;— by the laws of Elective Attractions and of crystalline forms ; — 

 and, even to a crrtain extent, by a discovery of the remoter causes of 

 those laws and forms. The cultivators of the Sciences, the directors of 

 the operations of the Art?, with public Institutions and Societies, have 

 become every year more numerous and rapid in their increase ; at the 

 same time that new Roads, Bridges, Canals, and other National Works, 

 as well as private undertakings, have been every where established to an 

 unprc. ::ent. 



Under such circumstances of national vigour and exertion, we have 

 found the situation of Journalists of the Discoveries and Improvements 

 mace by Philosophers and Men of Research, in every part of the civi- 

 lized world, to be most honourable and truly gratifying. Public appro- 

 bation, private friendship, and a reasonable remuneration, have consti- 

 tuted our reward. Upon various occasions, however, our Correspondents 

 have complained that the same Academical Papers, and Articles of Infor 

 mation, have been printed in both Journals ; and they have, in i"' ; r sepa- 

 rate letters, requested us to consult together upon some means ( i remedy 

 ing this inconvenience, and increased expense upon many of our Readers. 

 Uut it seemed impossible to obviate this inconvenience in two distinct 

 works, ; both equally under engagements to present to the Public every 

 thing that might prove new, interesting, and valuable. We have conferred 

 upon this and other consideration? 1 ' which might render our intercourse 

 with the public more effectually useful ; and the result of our delibera* 

 tions hns been, that it would certainly be best that we should unite, and 

 that the joint product of our exertions and our correspondence should be 

 lidated in one Periodical Work ; affording all that has hitherto been 

 considered as desirable in the plans and conduct of both ; bui. -s irom 

 the objection just stated, and perhaps one or two more upon which it is 

 needless to enlarge. 



The Philosophical Journal will henceforth be discontinued ; and Tht 

 Philosophical Magazine will be conducted by William Nicholson anc 

 Alexander Tilloch, ia the same manner as it has always been carriec 

 on ; but with every attention to improvement which the joint exertions o 

 the Editors, and the Communications of their Friends and Correspondent 

 can afford. 



Mr. Nicholson, therefore, requests from his Readers a continuance o 

 that intercourse with which he has so long been gratified ; and that tin 

 patrons of the Philosophical Journal will give their orders for the Philoso 

 phical Magazine and Journal, through the medium of their own Book 

 sellers, as usual. Communications, addressed to the Editors, Pickett Place 

 Temple Bar, will meet with due attention* 

 Motion, Dec.Cl, 1813, 



