CONTENTS 



TWENTIETH VOLUME. 



I. Account of the Voyage iimicr token Inj the Spaniards 

 to the North-JVesi Coast of' America in 1792 . . . . Page 3 



II. On the Catoptrical and Dioptrical Instruments of the 

 Antienls ; ivitk Hints respecting their Revival^ or Re- 

 invention and Improvement in modern Times 14 



III. On the Decline of Mathematical Studies, and the Sci- 

 ences dependent upon them. By the Rev. John Toplis, 

 A.M. 25 



1\^. Experiments to ascertain uhcther there exists any 

 ylffiniti/ letwixt Carbon and Clay, Lime and Silex, se- 

 parately or as Compounds united with the Oxide of Iron 

 forming Iron Ores and Iron Stones, By David Mushet, 

 Esq. of the Calder Iron- 1 Forks 31 



V. Letter from Dr. Thornton to Mr. Tilloch on the 

 Cow- Pock; with an Account of the Cases in Fulwood's 

 Rents 3fi 



VI. Comparison of the Small- Pox and Cow-Pock Inocula- 

 tion. i?y Charles Brandon Trvk, Esq. Senior Sur- 

 geon to the County Hospital, Gloucester 60 



VI I. Memoir on Nickel. JBy C. Thenard 63 



VIII. On the Orbit of the new Planet discovered by Mr, 

 Harding at the Observatory of Lilicnthal, near Bremen, 

 on the \st of September I 804 70 



IX. Description of improved Malt Kilm for drying Malt 

 by heated Air 71 



X. Cursory Sketch of a Specimen of a Dictionary of the 

 Gealic Language. By Cuxhbkrt Gordon, M-D. 72 



XI. New Method of rendering Platina malleable. By 

 Count Apollos Moussin Poushkin. Made pub- 

 lic, at his Request, by Charles Hatchett, Esq. 

 F.R.S 76 



XIT. NfJtices respecting New Books 78 



XIII. Proceedings of Learned Societies 79 



XIV. Intelligence and Miscellaneous Articles 81 



Vol. 20. No. 80. Jan. 1805. a XV. Letter 



