KK|UK COIFS If \N\jrXCTOR4ESi 121 



tnsttrcn of feverai hundred weight of brimftone; but men"* 

 fears on this head are now fo much allayed, that we fee fe- 

 veral of thefe maiitifa&or ies profper in peace i« the raidft of 

 our cities. 



The di filiation of aqua for lis and fpirit of fait, m other A«j«a forts* m 

 words, of the nitric and muriatic acids, are not more danger- { P*' A °* **•' 

 ons than that of lulpluirtc acid. The whole of the procekts 

 performed in an apparatus of gfafs or earthen- ware, and it is 

 nnqueftionably (he great intereti of the manufacturer to dirai- 

 nifc the volatilization or tofs of the add as mach as potfibie. 

 Yet, let him pay wh a tever attention he will to this, tl»e air 

 breathed in the manufactory is always impregnated with tire 

 fraeH peculiar to each of theie adds; but you may Tefyhe there 

 freely and fafely, the men who work in it daily are not at all 

 incommoded by it, and the neighbours would be very muds in 

 the wrong to complain- 

 Since the manufactories of white lead, of verdigri«, and of Vonegtu 

 fugar of lead have increajed in franco, the demand tor vine- 

 gar has been enlarged. 



When this acid isdiiliffed, to lit it for forae of the purpofes D?fc$e**3aB- 

 for which it is ufed, it dilfufes to a diihnce a very ftrong fmeliS* 1 "* 

 of vinegar, in which there k no danger; but when a foiution 

 of lead la this add is evaporated, the vapours aflame a fweet- 

 ith character, and produce in thofe who reipire them confianthr 

 ah 1 the effects peculiar to >the emanations of Jead itteJf. Hap- 

 pily thefe elfeels are confined to the people who work in the 

 manufactory and are unfelt by thofe who dwell in the vici- 

 nity. 



The preparations of mercury and of iead, fbofe of copper, Miners V®- 

 antimony, and arfenic, and the procefles of gilding on metals, P w *^ on % -*«* 

 are none of them without fome danger to the perfons who re-~ 

 fide in thofe manufactories, and are concerned in tUe opera- 

 tions; but their effects are bounded by the walls within which 

 they are carried on, and are dangerous only to the perfons 

 concerned in the manufactories. It is an object well worthy 

 the attention of chemifts, to investigate the means of prevent- 

 ing thefe injurious eflfe&s, and indeed many of the inconvent- 

 encies have already been prevented by the help of chimneys, 

 which convey the vapours into the air out of (he reach ©f rel- 

 pfrationi and at prefect the whole attention of adminiflraiion 



ought 



