Essas, Ge. 263 
The color is black or inclining to red, the 
fractory compact or vesicular ; in the former va- 
rious foreign admixtures are perceptible, which 
will be pointed outin the separate description; in 
the latter the concavities are often numerous and 
close: these resemble the lavas rolled from our 
craters by the most recent eruptions, in a semi- 
fluid state, partaking of the nature of slags: 
‘many of those in which the fracture was com- 
pact could scarcely be distinguished from the 
common Basaltes of this Island. 
At the river Kawung, which flows near the 
Western boundary of this tract of lava, in a 
situation about two miles North, — to the 
West, of the g observ. 
the most regular assemblage of Sirm stones 
‘hitherto noticed in any part of this Island; the 
fragments appeared to remain in the spot where 
they had been formed, the angles were still re- 
gular and sharp, and the extremity projected in 
-most cases towards the rivulet with very little 
‘inclination. The separate fragments were four 
‘sided, and the angles mostly regular; the whole 
groupe occupied a length of about 30 yards 
near the rivulet, and 5 or 6 fragments were piled 
almost perpendicularly on each other; in a few 
intances only, they presented the longest side. 
This scien ras was oekaki as it exhibited 
the stone (of the Trap family 
Basaltes) | had. had bikers Bearing in which the 
angles were not rounded by attrition or shewed 
the marks of having been carried by a current. 
na: the river Tiajum I found again, in a si- - 
ion South-west of the village of Ajibarang, 
; aye Aron of the extend of this tract of 
“Lava: here the fragments were mostly separate 
