VI 



C ON T E N T S. 



V. A Memoir, in which the Queftion is examined, whether Azote be a fimple 

 or compound Body ? By Chriftopher Girtanner, Doftor of Phyfic at Got- 

 tingen. (Continued from page 140.) - - - p. 167 



VI. Further Remarks on the Preparation of Prufliate of Pot-afli — Method of 

 purifying Cauftic and carbonated Aicalis from Sulphate of Pot-afli. By Mr. 

 William Henry - - - - p. 171 



Improvement in the new procefs tor preparing the pruffiate of pot-afh. Purification ot" aicalis by 

 aWlrafling the carbonic acid by lime, and precipitating fulplmric acid hy a folution of pure 

 barytcs ; after which carbonic acid may, if required, be added. 



VII. On a New Fulmiiaating Mercury, By Edward Howard, Efq. F. R. S. 



p. 173 



VIII. Ancient Account of Parhelia feen in Cumberland. Communicated by 

 Mr. H. Sargeant. - - - - p. 178 



IX. Account of the new Eleftrical or Galvanic Apparatus of Sig. Alex. Volta, 

 and Experiments performed with the fame. — W. N. - p, 179 



Defcription of a pile of plates of zinc, filver, and wetted cards, which give the eledlric fliock 

 repeatedly without limit of number or new excitation. Effeds of this eleiSlric ftream on the 

 organs ot fenfe. Examination of the inflrument. Difcovery that it decompofcs water, be- 

 tween two wires in a tube. Oxidation of metals. Separation of oxygen and hydrogen. Other 

 experiments and enquiries. 



X. Some Experiments and Obfervations on Galvanic Eleftricity. By Mr. W. 

 Cruickfliaak, Woolwich. Communicated by the Author. - p. 1 87 



Experiments made by pafling the current of Volfa's pile through wires with a fluid interpofed. 



The pile defcribed. It gives the eledric explofion and fpark at pleafurc. Nature of the gafes 

 '^ extricated from water. Experiments with water tinged with litmus — with Brazil wood. Re- 



dudion of metals from their folutions, Decompofition of other falts, &c. 



Scientific News, Accounts of Books, &c. . - - p. 191, 192 



Magnetic Dip at Prince of Wales's Ifland. — Infufibility of Tungften. — Gcoketrie dejiripthe, of' 

 Gafpard Monge. 



AUGUST 1800. 



Engravings of the following Objefts: 1. A new Inftrument fov examining mi- 

 neral Strata after boring. 2. An apparatus for raifing Water on the Principle 

 of the Syphon. And, 3. Dr. Hooke's Principles of portable Time Pieces, 

 written in the univerfal CharajSler of Bifliop Wilkins. 



I. Experiments on the Produftign of Air by the Freezing of Water. By Jofeph 

 Prieftley, L.L.D, F.R.S. &;c. &c. - - - p. 193. 



Whenever 



