(9cii<],:tpA|t^l>ich .order K)f<]3p<;ilies its qjaalitiea roucb inore nei»rly 

 ,fii3siflwlfttp :it, than tp the earths, t^ir composition becomes 

 .riCddily intelligible. Tbey wijl then be neutral salts, sili- 

 /Cjftte^, icither ,siaiple or. compound. Zeolite will be a com- 

 pound aak, a bydrated silicate .of alu>minu and soda, and 

 hence a cotnpuound of aluip:iina not very dissimilar to alum. 

 And topaz, the singular ingredients of which, discovered by 

 Mr. Klaproth, have called forth a qnery fiom the cele- 

 brated Mr. Vauquelin, with regard to the mode of their ex- 

 istence together*, will be likewise a compound salt, consist- 

 ing of silicate of alumina, and fluate of alumina. 



Our acquaintance with the composition of the several Is zeolite a hy- 

 mineral substances, is yet far too inaccurate, to render it ,^^inJ>"'" 

 possi'We to point out with any decree of certainty the one 

 of which zeolite is a hydrate, however the agreement of the 

 two substances in the nature of their constituent parts, and 

 in their being both electrical by heat, directs conjecture 

 ■toirards tourmaline. 



St, James's Place, Jan. 22, 1811. 



Addition to the Account of native Miniitm. 



^fjter I liad comrnunicated to the President the account 

 of the discovery of najjve jijiniufn, printed in the Philoso- 

 phjcifl Trausactiofis for ISOGf, I leanied, that this ore came 

 fr9rp the lead mines of Breylavj ip Westphalia. 



XII. 



^jctrq^tjfom ii Paper comfiunicated to the American Philor- 

 ^Oj^hic^l Sqc^ety p?f tl\e jpi^coverj/ of Palladium in a Native 

 4(k^ ^fCfold; ky, D/^r, J. Cloup, J)ireclor of (he Chemi^ 

 cal Prac^^fs ^t the Miiat of the U^itedt Sta t€s%. 



I 



N 1807 about 82:0 ounces of gold bullion were brought GqU from 

 iljito t\^f. g?i^t of \\^^ Vwted States. They copaisted of 120 ^raeTaT 



• Annales du Museum d'Hist. Nat. tome 6, p. 24. 



t See Journal, wl. XVI, p. 127. 



I Annal. de Ghim. vol LXXIY, p. 99. 



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