38. MIVERALOGICAL SYSTEMS. 



Explanation of made on each of thofe fubftanQCs, and immediately compare 

 the figures and them together; when with pleafure he found that there was 



formation of i i o • • i i >^t i i i * i i r 



cryftdsbythe "ot the lealt variation between them. Ihus had the Abbe 

 method of Hauy. Hauy difcovered by the help of geometry alone, (hat which was 

 confirmed by chemical analyfis, and this fatisfaclory accord 

 between two fciences apparently fo diftant from each other, 

 while fecuring each others fteps, ferves alfo to (hew the cer- 

 tainty of the principles on which they are grounded." 



Journal des Mines, Kxxvl'u page 21. 

 A morefingular anecdote is what took place with retpect to 

 the emerald and the beril. VauqueUn had analyfcd the 

 emerald of Prerou, and read the refult of it, at a fitting of 

 the Erole des Mines, which is preferved in the Journal, No. 

 XXXVIII. page 96: viz. of filex 64, of alumina 29, oxide 

 of chroma 3, of lime one, and of volatile fubftance 2; I 

 have negleded decimals. Soon after he difcovered a new 

 earth, which he called the Glucine, and gives the following 

 account of it to the National Inftitute : ** The Abbe Hauy 

 having obferved a perfect conformity between the llruclure, 

 the hardnefs, aild the weight of the beril and the emerald, 

 prefled me a few months back to make an analyfis of thefe 

 two fubftances, to know whether they contained the fame 

 principles, and in fimilar proportions. In the refult, the fafl 

 that will raoft iniereft the Inftitute is the difcovery of a new 

 earth, &c. &c." Annates de Chimie, vol. XXVI. p. 137. 



I am certain, Sir, that it will give you no lefs pleafure to 

 learn that Vauquelin, in confequence of this difcovery, made 

 an addition to the paper read at the Ecoles des Mines, beginning 

 thus, ** Since the reading of the above paper, having dif- 

 covered a new earth in the beril, and as this ftone, according 

 to the obfervations made by Hauy, contained fubltances fimi- 

 lar to the emerald, I have in that point of view made a new 

 analyfis of this latter fione." And the former analyfis was 

 immediately corrected, and the 29 parts of alumina became 

 36 parts of alumina and 13 of a iiezv earth. I hope. Sir, it is not 

 too much to fay that, on this occafion a new earth was dif- 

 covered, if not by, at leaft in confequence of, a geometrical 

 analyfis. 



But to return to our fubjed, the Abb<$ makes a difiin6lion 

 between the integrant particle and the primitive form. The 

 former, as I have faid, is that laft particle, which preferving 

 an exaft proportion of the component parts, contains the leafi 



number 



