afG Ft'ench National IhJIitute. 



into fiftion by llie galvanic fluid. A coniparifon of what 

 takes place in cx))eriments where metals are Ipoutaueoufly 

 c'xidatcd, by the interpofition of water, appears to him to 

 give great probability to this explanation, wdiich he llrenglh- 

 ens by leveral examples of limilar transformations, particu- 

 larly that of the pyrites of Bcrczof, wliich patfcs to the Itate 

 ok oxide, retaining, in three directions, the itri:c of the pri- 

 UHtive lidphuret. lie quotes alfo' numerous oblervations, bv 

 which C, flaiiy has proved the influence of fubtcrranean 

 eledricity on minerals. He entertains no doubt that this 

 new idea will extend the field of mineralogy, by expofing to 

 lis nature in continual labour, a6Vmg at the lame time on 

 iuafles and on intimate moieculre, by i'pontaneous attraction?, 

 and independent of all percuflion ; fo that this fublle fluid, 

 according to Guyton, will alfume tlie firft rank among thofe 

 fubftances which have been digniiied with the pompous name 

 of ?/ihier(i/i-zi'rs. 



Analjjjs of a phofpbated I^ead Ore. 

 This ore, of a yellowifli green colour, generally in fmall 

 brilliant grains, and in a quartzy arenaceous reddifli matrix, 

 is found \n pretty thick continued beds at lireitembcrg, near 

 Erlenibach, in the department of the Lower Rhine. C. 

 Sage has found, by an aualyfis, that it i-ontains, in lOO parts, 

 37 of lead, '^^ of (piart/^, and 30 ^ phol'phoric acid. The. 

 lead contains no filvcr. 



Ivmeralds found in France. 

 This difcovery was made by Lellevre. Travelling near 

 Limoges, he obfcrved, in the flones employed for re])airing 

 the roads, a hard greenith fubllance, wliich he judged to be 

 a beryl or an emerald. LI is eonje6liu'i^ was confirmed by 

 the chemical anal)'lis which \'auquolin made of fpecimens 

 lent by him to that chemift, and by ilaiiy's examination pf 

 their mechanical ftruclure. Thefc emeralds will not be of 

 much ufe as ornaments ; but they may be employed by che- 

 mifts to extract from tliem that kind of earth called gluchiCy 

 which Vauquelin difeovvrcd in ihe emerald and thebervl,and 

 which thele emeralds of Limoges readily furnilli, as C. Le- 

 lievre found feveral pounds of them, and was even able, by 

 combining the fragtnents, to recompofe a pnfm of more than 

 lour inches in diameter, and nearly the fame in height. 



xMETEOROLOGY. 



On the Acltnn which the- Lunar Period of Nineteen Years 

 exercifa oti the Variations of the Atmofphcre. 



As a decided influence on the variations of the atmofpherc 



has 



