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39 



II 



Such as have a metalic bafe 



d are chiefly made up of metalic fubftances 



VITRIOLUM 



1 . Ferri viride. 

 Green vitriol 



of fteei. 



2. Ceruleum ceri 



Blue and roman 



f; 



3 . Album zitichi. 

 White vitriol. 



4. Alhidum plumb 

 Sugar of lead. 



5. Ruhr urn. 



Though thefe metallic falts go by the general name of vitriol ; they are extreamly 



j J- 'f XX 



guifhed by the black 



Vi 



different in their appearance, as well as nature, and properties : the firfl fort is dii- 



communicates to all the aftringent infulions and 

 juices of Vegetables. The fecond, by the blue colour its folution, or the waters im- 

 pregnated with its falts or particles, do acquire, when mixed with any volatile fait. 

 The third, by the whitenefs of its folution in aqua fortis; and the fourth, by the milky 

 colour it communicates to common water. I have ken a fpecimen of the red fort 

 fome years ago in the repofitory of the royaJ garden zt Paris, but do not remember 



of what peculiar matrix it was thought to be 



rv 



Altho* thefe 



be the common matrix's of fuch falts 



you'll fometimes find the white to contain a quantity of 

 blue is mixed with fteel, or the green with either : 



form > thole of the blue, decaedral 



pointed. 



ney often vary, and 



The crvftals of 



copper 



i 



while 

 fir ft for 



the 



white, columnar and 



ik 



u 



t 





>! 







4 



in 











De phlogifio miner ali> & bituminibus 



Of the mineral Phlogiftic, and the 



bituminous Subftances 





i w 





L 





HAT there is a principle of this kind in every province of nati 

 dently feen by the fat of animals, the oil of vegetables, and ou 



t the following bitum 



;, is evi- 

 fubterra- 

 ous fub- 



fires : and hence, I think it is ap 

 (lances mufl necefTarily proceed from fuch a fource 

 fubftances; but more orlefs engaged, according to the nature and difpofition of the 



fly combined with oth 



admixture. We have divided the product 



of this clafs under the moft 



and convenient genera, and ranged them in the following order, viz. 

 I Q . Such as have the lead admixture of heterogeneous particles, ; 



d a 



their native fluidity in fome deg 



* * r 



i Q .NAPHTA 



1. levis pellucida, aqueavel 



Rock oil. 



This is found in great abundance both in Egypt and Per/it 



rally ligl 



and tranfparent, but of a pale 





- 





PISSASPHALTUM 



Fufcum Barbadienfe. ■ 



Barbadoes tar. f 



Obfcure bruneum Scotia & Dalecarlia 



Scotch tar, &c. 

 3 . Tenax nigrum. 



FofTil pitch. 



» 





Thefe phlogiftic fubftances are much of a kind with the foregoing, but greatly 



charged with 



other hetrogeneous particles 



of a dirty appearance, and moderately fluid 



They 



are generally opake 







11°. Such 





• 





