[ S 8 3 3 
all the intermediate numbers. The length of the 
piiims is not equal. I faw none of lefs than two 
feet long ; and I have feen fome of five. The thick- 
nets of them is not at all more equal : it is of nine 
inches and under. Many of them form a pillar by 
lying one upon another. All thofe, which I faw, had 
their extremities plain, and confequently were not 
jointed into the other. They feemed to me not at 
all joined together. 
The pillars, formed by feveral of thofe {tones, are 
placed exactly one againft the other, without having 
any void between them. They are in a fituation al- 
moft perpendicular. 
Upon breaking thefe {tones, their colour appears 
clearly to be black. It is a kind of pretty hard ba- 
laltes. It {trikes fire with fteel ; and it appears 
to be very like that of the Giants Caufey in Ire- 
land. 
This {tone mud be very common in the country' 
ofNafiau. I have been a fiu red, that fome leagues 
difiant from Weilbourg, there is an old caftle almott 
intirely built of it. 
I went from Weilbourg to Coblentz in the electo- 
rate of Treves. I obferved on the road thither, in 
the towns and villages, through which I pafied, that 
this bafaltes was made ufe of in the buildings and 
pavements. I made the fame remark in my journey 
from Coblentz to Colen thro’ Bonne. 1 found a 
pretty large heap of it in a village three leagues from 
Bonne. Thefe {tones feemed to be collected in or- 
der to be made ufe of. I met with no perfon, of 
whom I could inquire, whether there was a quarry 
in the neighbourhood. In continuing my journey 
4 E 2 along 
