238 Messrs. Jackson and Alger on the 
and has a small settlement, will afford him a safe retreat only dur- 
ing certain winds, as it stands nearly open to the sea. The trap, 
composing the bottom of this cove, is in distinct columnar 
masses, the surfaces of which present, from the action of the sea, 
assisted by the motion of sand and pebbles, shallow, basin-like 
cavities, regularly curving from the centre up to the edge, which 
is harder, and formed of quartz and jasper, and in some places 
has become highly polished. The quartz and jasper are inter- 
posed between the columns like a cement, and very firmly at- 
tached to them. We observed several columns beyond the reach 
of the sea, which exhibited to a less extent the same appearances, 
proving, however, that ordinary causes have a direct tendency to 
produce these depressions on their surfaces. The minerals we 
obtained in our visit to this spot, were found about one mile west 
from the cove, where we met with an immense waste of water- 
worn and nearly globular masses of trap, running down like 
a pavement into the sea. Many of these masses are highly pol- 
ished by attrition, and they frequently exhibit, on their surfaces, 
small globular concretions of heliotrope, or bloodstone, imbedded 
in a chalcedony of a very deep green color. This interesting 
mineral also occurs not far off in veins traversing amygdaloid, and 
exhibits, in the green chalcedony, which seems to owe its color 
to the green earth that frequently invests it, minute, thread-like, 
and diverging branches of a high crimson color. The chalcedon- 
ic part has a milky hue, and passes into carnelian. 
At Chute’s Cove, six miles east of the locality just mentioned, 
the rocks resume their abrupt character, and present lofty preci- 
pices of columnar trap resting on amygdaloid, abounding with 
zeolites. The shape of the cavities presented by this amygda- 
loid, is very singular; for instead of the spheroidal shape, in 
