go On rendering Paper indejlruclible by Fire. 



felvcs neither in whitenefs nor fmoothnefs from common 

 paper. They burnt very readily, and were reduced much 

 fooner to afhes than common paper. 



No. II. Paper dipped in nitrite of magnefa. — Paper dipped 

 in this fait appeared in nothing different from common 

 paper. It burnt as foon as it was brought near a flame, 

 and was converted to a very black coal, which however was 

 not fo friable as the iirft mentioned. 



No. III. Paper dipped in nitrite of ammoniac. — Leaves of 

 paper foaked in nitrite of ammoniac became again moift, 

 after they had been well dried by the heat of the fun. They 

 burnt in the fire and produced a very friable coal, which was 

 afterwards entirely deftroyed by the flame. 



No. IV. Paper dipped in muriate of lime. — Leaves of 

 paper which were dipped in this fait after it had been dif- 

 folved did not appear different, when dried, from other leaves 

 not prepared in the fame manner. When put in the flame 

 they burnt very readily, and almoft in the fame manner as 

 common paper, and were converted into a fomewhat white, 

 but highly friable coal. 



No. V. Paper dipped in muriate of barytes. — Paper dipped 

 in this fait did not feem changed in airy of its external pro- 

 perties. It burnt when placed over the lire, and produced ?, 

 very black fhining coal, which was however fomewhat lefs, 

 friable than the two laft mentioned. 



No. VI. Paper dipped in muriate of foda. — Paper dipped 

 in muriate of foda acquired more confluence and became 

 rough. It burnt in a flame, and the refidue was a very black 

 denfe and fhining coal, not more friable than the foregoing, 



No.VII. Paper dipped in muriate of potafh. — With muriate 

 of potafh the paper became fomewhat rough, but in other 

 refpecls no alteration was obferved. K burnt without flam- 

 ing, and was converted into a very black and friable coal. 



No. VIII. Paper dipped in muriate of tarsmmiac. — Paper 

 dipped in this fait underwent no vifible change. When put 

 into the fire, \}. burnt and was converted to a black coal; but 



when 



