Dr. J. W. Webster on St. Michael, &c. 251 - 
In the rocks which constitute this ledge, are imbedded 
nodules of flint of almost every variety of — form. 
They also abound with petrifactions of shells, &c. &c. 
No. 6. Argillaceous slate inclined at an angle of 45°. In 
every rile resembling No. 2 
No. 7. An alluvial valley. The soil consists of clay, 
wahigied with a calcareous mould, evidently the result of the 
decomposition of the rocks in its vicinity. 
No. 8. vide 
No. 9. ‘ rs 
No. 10. ee mestone. In this ledge the imbedded masses 
of flint and hornstone are so abundant, as to constitute al- 
most a third. 
No. 3 
No. 13. — 
No. 14. iittaddies fades of cmkooal of ae essentially the 
same with that described in No. 5. These form the termi- 
nation of the limestone region, on the E, ‘side of the Cats- 
kill mountains. ‘The geology of the intermediate space is 
perfectly uniform. The rocks are a species of sandstone, 
so fine as scarely to present the appearance of a conglome- 
rate, and with difficulty distinguishable from some of the 
coarser varieties of common slate. At the foot of the moun- 
tain the slate occurs, extremely well characterized, and con- 
tinues to be the predominant rock for a considerable dis- 
tance up the mountain, when the sandstone again appears, 
aint extends uninterruptedly at least ten or fifteen miles to 
the W. Here my researches terminated. 
. Art. 1V.—Notice of a New Work 
me description of the Island of St. Michael, comprising an 
account of its Geological structure ; with remarks on the 
other Azores or Western Islands. Originally communi- 
cated to the Linnean Society of New-England. — cg 
Wessrten, M. D. Cor. Sec. L. S. N. E. 
published by i. P.& C. Williams.” 
Tue Linnean Society was originally formed by a few gen- 
thesiibat ok Boston, among whom was the author of this 
