GEOGRAPHICAL TABLET. J^2 



albwlng for the fmall quantity of oxigen which had caufed 

 the oxidation of the extremities of the gold wires, the whole 

 quantify of the oxigen contained by the gas of the pile may 

 be valued in a very near approximation, at 0,31 of its volume; 

 and it is very nearly in this fame proportion that oxigen gas The Society 

 enters into the formation of water; it was thought that '^ of'"h^ei?^lk'^"'" 

 might thence be concluded, that the whole effed of the only decompofed 

 galvanic pile, during the entire continuation of the ex- '"? ^^'^^'' J"/^** 

 periment, had been the decompofition of a part of the water drogengafes,' 

 employed, and the feparation, in their ftate of purity, of ^"^^ '^'i^f ^'a- 

 the oxigen and hidrogen gafes which compofed it. The t^^en and that 

 Society then are of opinion, that M. Pachiani was deceived th? acid found 

 as to the nature of the acid which he announced that he men'c*w'^i'p"o- 

 obtained, and that this acid* might have been produced by duced bv jthcr 

 fome animal or vegetable fubflance employed in the appara- []^^-^"l^"^" 

 tiis. The Society does not hetitate to declare, that with the nounced, 

 apparatus which they ufed in preference, (as beinar the moil ^"'^ ^''^^"^ '^ 



/ I I.I n I- .. r • n r ., not pofllblc tO 



litnple, and the lealt hable to the innuence ot other matters,) tffcti anytfii 

 they do not think it poffible to effect any thing by the a<5lion ^y t^^ g?.ivanic 

 of the galvanic pile, but a decompofition more or lefs great, •'jg^j'JJ^Q'l-j,"^ 

 of the water ufed in the experiment, lion. 



VIII. 



Account of an Ancient Geographical Tablet in the Mufeum of 

 Cardinal Borgia, from fa Memoir prefented to the Academj/ 

 . of GoUingen, by Professor Heeven. 



In the Mufeum of Cardinal Borgia there is depofited an The tablet was 



ancient geographical tablet, from which an engraving has ^°""'* '" 'll^ 

 ° ** ^ o & mufeum of 



* M. Giobert, in Van Mon's Journal, pretends, that the acids Cardlaul Borgia. 

 and falts ufed in the pile circulate along the nvires, and pafs into 

 any liquor into which they are conduced j which does not ap- 

 pear probable. — B. 



The galvanic apparatus ufed in thefe experiments is called a 

 pile through the whole of the French paper, though from its 

 horizontal pofition the appellation does not feem very proper. 

 Trans* 



f This memoir is entitled, " explicatio planiglobii orbis ter- 

 raruni faciem exhibens, ante medium fee. xv. fumma arte con- 

 fefti ; agitaotur fimul de hiftoria raapparum geographicarura refte 

 inftruendaconfilia. 



Vol. XIII.— February, 1806. M been 



