423 
[Hartwell. 
1892.J 
All the other boulders on Pearl Hill are of granite ; this is of 
mica schist ; it has the cross-shaped crystals of staurotide, which 
the ledge contains : and the triangular base shows a stratification 
similar to that of the ledge. 
Upon the supposition that this boulder was from the ledge 
above it, search was made for the locality it once occupied and the 
contour of the first step gives conclusive evidence of its former rest- 
ing place, which is not far from nine hundred and seventy-five 
feet above sea level ; in addition to the contour just to the north 
there are the lateral remnants of two other pot-holes, which time 
has almost obliterated. 
The apex of the boulder now points eastward, i. e. away from 
the ledge. The position of the strata, as well as the excavation 
whence it came, indicates that the apex must have pointed toward 
the north : in other words it has turned quarter way round in its 
journey from its former to its present resting place, a distance of 
some sixty feet (twenty-five feet vertical). 
The pot-hole is situated near the apex of the boulder. Its|di- 
mensions are as follows : At the top its diameter is ten inches, 
which gradually increases, so that in the course of twelve and one 
half inches it is fourteen inches in diameter. It then narrows to 
nine inches in diameter in the course of two and one half inches, 
which diameter it retains for the remainder of its depth, which 
is nine inches* The whole depth is jtwo’[feet and the last three 
