CON T E N 1' S 



OF THE 



THIRTY-NINTH VOLUME. 



ji SYNOPSIS of the principal Elements of Astronomy; 

 deduced fhm M. Laplace's Exposition du Systeme du 



Monde ^ 



An Account of t lie Great Derbyshire Denudation . . 26 



Description of anew Leveliuig- Staff 35 



On the Cause of audible Sound in vibrating Strings, Tuning- 

 Forks, &c,; on the Use q/ Hawkins's Mouth Tuning- 

 Forks; on Earl Stanhope's proposed Steel Piano- 



Forte Strings, &c. 37 



On the Nomenclature of the New London Pharmacopoeia 



39 

 General Method for determining the Orbits of Comets 40 



A Case of Morbus Pedicularis 49 



Reply to Dr. Kelly's Letter on his supposed Discovery of 



an Error in the Nautical Almanac 51 



A Reply to some Observations and Conclusions in a Paper 



just published, in the Second Fohime of the Medico- 



Chirurgical Transactions, on the Nature of the Alkaline 



Matter contained in various dropsical Fluids, and in the 



Serum of the Blood 64 



On the Localities of certain Reliquia, or extraneous Fossils, 



found in Derbyshire 81 



Account of some remarkable Cases of Venereal Infection 90 

 Vvl. 39. No. 170. June 1812. a 



