The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1851-05-13

II, however, the ring supposed TO be large,
gaseous mass Of circular figure the condemnation which
would occur ut the point OF apheon might lead TO che
micsl action. Precipitation might ensue, and the
cessary consequence would seem to be constantly &c
celeI ated accumulation at this point which would tern
nate in the production Of planet.
Professor HENRY expressed the qualification he felt in
listening to the result OF Professor Perces study and
investigation.
The following papers then read
l. On the age Of the Sandstone of Lake Superior with
description Of the phenomena Of the associated Igneous
Rocks by Messrs Foster and whitney, u s. biologists
for the Lake Superior Land District.
On the Gephyrea of the Atlantic Coast Of the United
States by L. y, Pourtales, Of Washington.
g. On the limit Of perceptibity Of direct and reflect
ed sound by Professor Henry Of the Smithsonian lnsti
T. Current Chart of New York Bay from observations
in the Coast Survey BY A, d. Bache, Superintendent
On the Post permian date of the red sandstone Rocks
Of New jersey and the Connecticut Valley, shown by
fossil mains, by W G. Redfeld, Of New York.
ofscers Of the Young Mems Mercantile Library Associa-
ton rendering the free 1 their Libray and Reading
Room to members OF the Association during their stay in
the city
The invitation accepted, and then the Association
took a recess until half past three o'clock, T. NJ
AFTERNOON SESSION.
The following papers read t*rt
l. On the structure and reproduction of Particles, by
Professor L. hgassiz OF Harvard.
On the existence of Phosphorus in certain Des
Mones Iron Stones by Dr. D. D. Owen u 8. Geologst Of
the Chippewa Land District, read BY Major Richard
g. On the Superficial Deposits of the North West by
Charles Whittescy of the L. s. Geological Survey Of
Lake Superior Ia
A. On the Drift phenomens Of Lake Superior. by II.
Desor Of the IT, s. Geological Survey Of Lake Superior
The following abstract Of paper by w. p. Blake, Of
New York the optical character Of varieties Of
mica was presented -
have made such additions to the porscope described
by the last meeting Of tho American Association,
that with 1t have been enabled to examine many dark
colored mcas In plates much thicker than was previously
possible find that most or all OF the sniaxal mcas
in reality biaxial with small inclination OF the
axes.
list Of these micas is presented with the communca
ton and in IL mentioned the mica from Greenwood
Furnace, Orange county. n " and several specimens
from Mount yesuvus these micas are OF green color
and found crystallized in rhombc and hexagonal
plates, and have heen considered belonging to the
rhombohedrc or hcxsgonal system Of capitalization As,
however they shown to have optical character
consistent with diametric form II il probable that the
crystals modified obque prisrns.
Some specimens from different localities are so dark
colored that it Is impossible to give them satisfactory
animation; and list Of such i given As however the
mcas examined from Greenwood and Sesuv!us baxi
al it is probable that all micas with similar chemical
constitution also and doubtful whether there
any which can be considered uniaxial.
After which, the Association took until eight
O'Clock this evening +#