n CONTENTS. 



XVII. Obfervat'ions and Experiments upon Dr. James'^ 

 Powder; iv'ith a Method of preparing, in the hu7nid PFay, 

 a fimilar SubJIance. By RiCHARD Chenevix, £/y, 

 F.R.S. M.R.I. A. - - - 108 



XVIII. Ohferviitions and Experiments undertaken with a 

 Vieiu to determine the Quantity of Sulphur contained in 

 Sulphuric Acid', and of this latter contained in Sulphates 

 in general. By Rxchaud Chknevix, Efq. F.R.S. 

 M. R.I.J. - - - - 112 



XIX. Experhnents on Platina. Bv L. Proust Ii8 



XX. On the Analyfs of JVine. By C. Chaptal ia8 



XXI. Account of a Dejce7it into the Crater of Mount Vefuvius 

 by eight Frenchmen on the Night betivecji the ihth and 

 j^th of July 1801 - - 134 



XXII. Obfcrvations on a deflruBive Kind f InfcEls foimd 

 infome Parts of the Rti/Jian Empire, and in the Barinat of 

 Temefwar. By Profefj'or Pall.\s - 140 



XXIII. Memorandums, Hints, Precepts, and Recipes^ for 

 the Ufe of Artijts, Matmfa£lurers, and others ; including 

 •various fhort Proceffes either ne^u or little known 144 



XXIV. Letter from Prof effor Vict'kt:, F.R.S. Profefforof 

 Natural Philofophy at Geneva. - - 149 



XXV. On the hifluejice which the Sun has on the State of 

 the Barometer. JBy J. J. Hemmer - 151 



XXVI. Letter from L. W. Dillwyn, E//. to W. H. 

 Pepys jun. Efq. refpeGing the Effects of the Oxytnuriatic 

 Acid on the Growth of Plants - - 358 



XXVII. Obfcrvations on the Queflion, whether mixed Metals 

 can be dijlinguifhed by the Synetl. By M. BtETTlGER 159 



XXVIII. Some Obfervations on the Agitations of the Lake of 

 Derwent JVater, and its foating I/lands. By a Corre- 

 fpondent - - _ 163 



XXIX. Defcription of a nezu JVater Engine, invented by 

 Dr.V^v.^T, of the Ijlund of Jamaica - i65 



XXX. Defcription of a nezu Hygrometer - 168 



XXXI. Hijlorical Sketch of the Inflitution and Progrcfs of the 

 Royal Society of London. Contitrued - 168 



XXXII. Proceedings of Learned Societies - i']6 



XXXIII. Intelligence and Mijcellaneovs Articles 189 



XXXIV. On the Che?nical Kfiowh'dge which thj Philofbphers 

 of the 16th and iph Centuries had of the d/flrent Gafes 



193 



XXXV. An Account of fome Galvanic Co7nbi nations, formed 

 by the Arrangement of Jingle Metallic Plates and Fluids, 

 (inaiogous to the new Galvanic Apparatus of Mr. Volta. 



By 



