Mr. Hatcuett’s Obfervations on Bituminous Subftances, 149 
tranfparent, and of a yellowifh brown inclining to orange. It is 
foft, pri paki and reg mvt mn adheres to the fingers, 
A ‘No. To. 
The fame of a darker brown, and harder in a {mall doit The 
{pecific gravity of this {pecimen is 0,90533 water being eftimated 
at 10,000 at temp. 60° 
.. A, No. tte. 
 Bdehaeres: of .a thet brown, harder than the former, This ex- 
aétly refembles the cahout-chou in the degree of .elafticity, and in. 
the property which: it iy of removing the traces of’ black- 
lead. 
A, No. 12. 
The.fame, hut sather harder, . 
A, No. 13. 
". ‘The fale blackith brown, which is feat elaftic when the 
weather i is warm, but is brittle when-cold. | 
: A, No. 14. 
‘The fame of a blackith brown, nearly black, which fearcely pof- 
fefles any elasticity 3) itcbreaks, and refembles scr in icin 
colour and fracture. 
Ay No. 15. 
‘The fame of a reddith brown,) petfectly hard: and brittle. The 
Gukibie. of afphaltum are Bene in, Hes arson 
The fpecific gravity is10,233. > lot 
The other fpeci¢s of claftic bitumen, whith I fhall diftinguith by 
‘' the 
