ADVERTISEMENT. 



place of abode ; which letter fliall never be opened by the 

 ibciety, except in the cafe of a fuccefsful candidate. 



2. No performance, invention or improvement, on any 

 of the fubjeds propofed, for which a patent or any other 

 reward fliall have been obtained, before prefenting it to 

 the fociety, fliall be confidered as entitled to the premium. 



3. In lieu of the money which Ihall be awarded by 

 the fociety, as a premium, any fuccefsful candidate fhall 

 have it in his option to receive a gold or filver medal, or 

 piece of plate, with a fuitable infcription of equal value. 



4. The fociety referve to themfelves the power of giv- 

 ing, in all cafes, fuch part only of any premium propofed, 

 as the performance lliall be adjudged to deferve ; or ot 

 withholding the whole, if it fliall appear to have no 

 merit above what may have been already publifhed on 

 the fubjed. The candidates may, however, be aflured, 

 that the fociety will always judge liberally of their fe- 

 veral claims. 



Mr. I. H. De MAGELLAN, of london, 



Having made a donation, to the fociety, of two hun- 

 dred guineas, to be vefted in a permanent fund ; that the 

 intereft arifing therefrom may be difpofed of, in annual 

 premiums, to the authors of the heft difcoveries or molt 

 ufeful improvements, relating to Navigation, or to Natu- 

 ral Philofophy, mere Natural Hiftory only excepted ; — 

 the following are the rules and conditions, adopted by 

 the fociety, for the difpofition of the propofed premiums, 

 in conformity to the intention of the Donor, viz. 



\. The candidate fhall fend his difcovery, invention or 

 improvement, addreffed to the Prefident or one of the 

 Vice-Prefidents of the fociety, free of pofiage or other 

 charges ; and fliall diftinguifli his performance by fome 



motto, 



