( xlili ) 



N». 



Page. 



277 

 289 



XXXII. Experiments and Ohferiiatiom on Land and Sea Air. By 

 Adam Seybert, M. D. ,g 



XXXIII. Trcihjlation of a Memoir on a mnu Species of Siren. By M. 

 de Bcauvois, 



XXXV. OLfervtitlons intended to favour a fuppofitlon that the Black Color 

 (as it is called) of the Negroes is derived from the Leprofy. By Dr. 

 Benjamin Ruih, 



XXXVI. An Improvement in Boats, for River-Navigation, defer ibed in a 

 Letter to Mr. Robert Patterfon, 'by Nicholas King, 298 



XXXVII. General Principles and Conflrudion of a Sub-marine Veffel, 

 cemmunicated by D. Bufbnell of Conneifiicut, the inventor, in a letter of 

 Dauber, 1787, to Thomas Jefferlbn then Minljler Plenipotentiary of tbe 

 United Slates at Paris, ,q« 



XXXVIII. The Dejcriptlon of a Mould-board of the leaf refiflence, and of 

 the eafieji and mojl certain confrutlion, taken from a letter to Sir John 

 Sinclair, Prefident of the board of agriculture at London, 5 1 -. 



XXXI X. Experiments upon Magnetifm. Communicated in a letter to Tho- "* 

 mas JefFcrlon, PreJiJent of the Phllofophical Society, by the Rev. 

 James Madilbn, Prefdent of William and Mary College, ,3, 



XL. rhermomttrical Olfervatlons made at Fort IVaJhlnglon, Commencing 

 June 1790, and Ending April 1791. By Daniel Britt and G. Tur- 

 ner. To ivhich are added, for feme time, the Rife and Fall of the Ohio. 

 Communicated by G. Turner, ,,0 



XLI. Calculations relating to Grifl and Saw Mills, for determining the 

 quantity of Water necejary to produce the defired effed when the Head and 

 Fall are given In order to afccrtaln the dlm;nftons of a new invented 

 Steam Engine, intended to give motion to Water-wheels in places where 

 there is no Fall, and but a very fmall Stream or Spring. By John 

 Nancarrow, o 



XLII. Memoir on Amphibia. By M. de Beauvois, ^62 



XLI 1 1. An Appendix to the tim Articles In this Volume, (p. \.) by Dr. 



Prieftley, in a letter to B. S. Barton, M. D. '382 



LXIV. An Inquiry Into the comparative e feels of the Opium Ofpclnarum, 

 extraded from the Papaver Somniferum or White Poppy of Llrmarus ; 

 and of that procured from the LaBuca Satlva, or common cultivated 

 Lettuce of the fame author. By John Redman Coxe, M. D. An 

 Honorary Member of the Philadelphia Medical Society ; and a 

 Senior Member of the Chemical Society of Philadelphia, 387 



LXV. Experiments and obfervations, on the atmofphere of marfhes. Bv 



Adam Seybert, M. D. 415 



LXVI. An account of a Kettle for toiling Inflammable Fluids In a let- 

 ter from Thomas P. Smith, to Robert Patterfon, 431 



LXVI I. An Effay on a new Method of treating the Effufion which colkas 

 tinder the Scull after FraHures of the Head. By J. Deveze, Officer of 

 Health, of the firjl clefs, in the French Armies, 4,3 



LXV I II. Memoir on the Sand-hills of Cape Henry in Virginia, By B. 



Henry Latrobe, Engineer, ' . ,„ 



LXIX. Supplevient to Mr. Latrobe's Memoir, 444 



LXX. Ac- 



