*5a On ihr. Metal cmt4iit*d 



combined itfelf with the acid of the carbonaf.3 a nd that tl,<* 

 alkali was afterwards united with a particular acid, which 

 gave k an orange -yellow colour, and the property of produ- 

 cing crvftals of the fame colour. 



2. That, this new combination was decompofed by mineral 

 acids-; and that on caufing the liquor, in which the decom- 

 pofition had been effected, to e there was obtained, 



on the one hand, the fait formed by the mineral acii which 

 had been added ; and on the other, the acid of the red lead, 

 under the form of elongated prifms <rf a ruby colour. 



5. That the combination of the acid of the red lead with 

 potafh formed, with the nitrat of mercury, a precipitate of a 

 cinnabar red colour ; with the nitrat of lead, an orange-ycL 

 low fediment ; with the nitrat of copper, a precipitate of a 

 chefinut-red, £cc. 



4. That this acid alone became green by the contact of 

 light, by a folution of tin and of the greater part of metals. 



5. That, the fame acid, either free or in a flate of combi- 

 nation, combined itfelf with borax, microcoimie fait, and. 

 glafs; and communicated to them a beautiful etncrald-greeu 

 colour. 



Such, in a few words, are the' principal properties of the 

 add of the new metal contained in the red lead, as an- 

 nounced in my tlrit memoir. I fhall now proceed to ex- 

 amine the other character! fmg marks of this fubnanee; and 

 fhall enlarge chiefly on thole which ought to make us con- 

 fkler it as a particular metal, and on thofe which difiinguilh 

 it from other bodies of the fame ciafs. 



Exp. f . Action of Acids on the Red Lrad. 



If one part of the muriatic acid, mixed with as much 

 ■seater, be poured over the red lead, reduced to powder, there 

 will be formed muriat of lead, which depoiits itfelf under the 

 Form of white cryfrals, and the liquor afTuines a very beauti- 

 fu! orange colour. 



