The I N D E X. 



MHpickel - pyrites, what, 

 21,99 

 Mify, what) 279, feqq. 

 Mixt- vitriol, what, 283 

 Mountain-cryftals, origina- 

 tion cf y 92 



N. 



XJIHILUM, what, 

 ** 193 



O. 



QCHRE,wk, 58 

 ^ Ores, peculiar figures of 

 26 feqq. wto, 29, 247, 

 Produclion of, 56 feqq. 

 1 ZZ* Produclion of by 

 art, 248. Proportion 

 of yield in metal, 1 20, 

 feqq. Generated damp 

 ways, 255 



Orpiment, wZw/, 197 



PHOSPHORUS, parable 

 from arfenick 211. 

 Jlfinity of to arfenic and 

 %ink, ib. How to make 

 an extraordinary phofpho- 

 rus, ib. 



pompholyx, what, 194. 



Prince's - metal, what, 188 



Pyrites, what, 100. Names 

 of 12 feqq. <S^#r/# of 

 17, feqq. Principles of ib. 

 Per what worked, ib. £/^ 

 fential and incidental parts 

 ef ib. IdiomorphoS) what 



ib. SynmorphoSy what, ib. 

 Pyrites-Ww^, «/te, 25 

 Botryte:, what, ib. Py- 

 rites, that yeilds no copper, 

 always round, 29. Multi- 

 plicity of the figure of ib. 

 Colours of, 29 feqq. Ifaft 

 0/*, 38 feqq. Produclion 

 of 56 feqq. Remote parts 

 of, 97. Proximate parts 

 of, ib. Contributes to the 

 formation of zink. 197. 

 Principles of, 244 feqq. 

 Damps of, in what con- 

 fifing, 260. What fort 

 yields vitriol, 296. Which 

 vitriolifes foonefl or jlowejl, 

 301. Worked for ful- 

 phur, 333 feqq. Effedls 

 infmelting, 345 feqq. 

 Why a flux, 347 feqq. 

 What in the pyrites con- 

 tributes to the ad of [melt- 

 ing, 348 feqq. Hejfian, 

 hi/lory of, 353 feqq. 

 Specifick gravity of, 359. 

 Mifcellaneous, obfervatims 

 371 feqq. 



on 



QUart£, what it contributes 

 ^ to the produclion of ores, 



263 



R, 



T% Ealgar, what, 197 



S. 



