in the Pyrites; jm 



(14. ) The glafs, to which it runs along with 

 lead, is fomething extraordinary : not to mention 

 other remarks at prefent. 



Once more ; arfenic, zink, and phofphorus^ 

 Hand greatly allied to, and probably are derived 

 from each other. Zink and phofphorus are bodies 

 fufceptible both of fire and flame •, the former, on- 

 ly by an external accenfion ; the latter, by an in- 

 ternal felf motion, by means of the air. Zink 

 fmells fetid, like phofphorus, and phofphorus 

 fmells like hut fume. Phofphorus unites with 

 quickfilver. Arfenic and quickfilver are nearly al- 

 lied. In cadmia-fcrnacum there is an actual, tho* 

 not a formal zink. Arfenic certainly lodges in, and 

 zink is only derived from ore: yet they are pro- 

 duced one after the other ; firft, the arfenic, then 

 the zink -, «:hey alfo adhere to each other. Phof- 

 phorus too may be prepared from arfenic, or an #r- 

 fenical body. 



Reader, weigh well what I have already men- 

 tioned on this head •, and here, for thy further in- 

 formation, take an extraordinary experiment of 

 the celebrated Dr. Meuder's Drefden, iately difco- 

 vered by him, and imparted to me: Take orpi- 

 mint and iron-filings, equal parts, and fubliming 

 the mixt mafs in a body or cucurbit, among the 

 fublimate, thus procured, rub in on a porphyry, 

 ten or twelve parts of lunar cryftals ; then mooting 

 out the whole on paper, it will inftantly take fire. 



P % CHAP 



