National Republican. (Washington City (D.C.)) 1872-1888, 1874-04-24
NATIONAL AoADBMY oFso1BHcE

FOURTH DAYS SESSION-1NTERESTI
ESSAYS ON SCIENTIFIC SUBJ ECTS.
/ The third session OF the National Academy OF
Science was held yesterday at the Smithsonian
Institute; Prof. Henry presiding r. b
The programme, as Published IN yesterdays
REPUBLICAN,, Is follows, was carried out:
THE VIVID IN CYCLONES. ~
Professor VIM. H. Terrell read paper bearing
on the direction Of the wind In cyclones. The
weather maps Of the signal service have rendered
Sr reson ~ ses that
which the surrounding atmosphere has circular
or gyrating motion, In direction Tin the northern
hemisphere) opposite to that Of the hands Of Q
Before these ideas we're uuderstOod as well as
now, Espy, who was one OF the pioneers on the
air-currents moved radially inward, rushing d.
rectly toward the storm centre and upward IN the
latter while Redheld's observations led him TO
about the centres following nearly circular paths
sh p, nos materaHy approaching the centre
recently made by . Scottish meteorologist, Of q
large number OF observations, taken 1t fifteen
different stations. These show that both OF the
are partially true a. the
the two, being dehected from the tangent inward
twenty SsGgs S an sns si thus
around the storm centre, but at the same time
gradually approaches it, the path described By It.
therefore, being spiral around and gradually
A very Interesting point is that this angle Of
detection is greatest tabout s5o) upon the north
east side OF the cyclone least (about eo) upon the
southeast side, and near the average Tor from
Is to 2ool upon the northwest and southeast SIDES,
the storm =; as whole usually moving n9rthwest
these reflections occur as they do. Were the afr
current to move with no friction they would tend
iocity in the direction Of the tangent, they in.
cline inward toward the centre. Therefore, on
land, vhere the friction Is the greatest the dehsc
is also the greatest. Thus may probably be ex-
planned Espy's and Redpath's differing conolu,.
sions, the observations discussed by the former
having been taken upon land, those by the latter
being nearly wholly from the sea, where the fric-
top IL less and the courses of air currents conse-
Mss q ses I
upon the outer borders Of the main cyclone more
gentle current must exist moving In the opposite
"monenfsh Of Inertia must equal Iero,) and that
In countercylones, when the air descends through
the centre, spreading outward, the gyratory mo
motion Of the air up through the centre Of low
pressure and outward to the borders Of the sys-
tenn; and thence downward and into the cyclone,
near the earths surface the detection Of currents
70 inward from the tangent, at certain distance
tangent, while still higher it would turn more
Professor A. NJ Mayer addressed the academy
sOnOrous sensation" The Professor handled his
subject knowingly, and his efforts were pleasing
DR.. Hayden presented a brief outline of the
history progress and results of the United States
geological survey Of the Territories since its conn.,
IN shs iPsng 81 M H.
contents, was stated. The growth Of the organi-
ration of the party, their workin Colorado during
mentioned He closed with an appeai to ali right.
minded men not to let these explorations cease
until the public domain is made known to our
Pf6t B. F. silliran next addressed the acad.
envy "on the currents Of Telluriods of gold and
silver IN Colorado with remarks on the Gepeei Of
SiSsSgS RBSfHTs Haydn S
the Red Cloud and Red Headed mines in Colo
rado, at Gold hill. The ores, no said, are found
through Interchangeable rocks Of the Frantic fam.
lily. This dyke Is about fity feet wide dipping to
the noTthSsst at an angle Of eighty degrees, and
sylvante and petyits found in vein Of quartz
adjacent to and In immediate contact with the |
phorphyritic dyke
The walls Of these two veins are obscureIy de-
fined on the side Of the granite, but they vary in
width from few inches to three or four feet No |
gang, but only the yellowIsh sllvery-white sylvia
mite, In crystalline plates, and the granular,
lead-eolored or lron-black masses OF the petIite.
the Professor, which was brought from the Red |
Cloud lode, and had assay value Of over $50 900
10 the ION. Inc analysis oil the eyivanite demon
strated the presence of sellenium, as we'll as
combined with gold and silver.
The proportion OF gold over silver Is as about |
two to one or nearly thirty per cent of gold to If
teen per cent. Of silver. He expressed the opin-
ion that the injection Of the phorphory vein or
dyke from the bottom by Its plutonic action ae-
counted for the presence of these rare ores
Of gold and silver. which unquestionabiy accom-
panied the fnlec n OF the molten mass and pro-
iuced the segrc. Ion Of these ores into the ad-
accent granite r.gKs, and which formed the two
reins which az aow explored for the precious
netals:
Professor walcott Gibbs next addressed the
academy on "Metamefism in inorganic chem
stry." l.
Professor S. Alexander presented HIS views on
/ small correction OF the velocity Of light as de-
lueed from experiments.
The subjects presented were all illustrated by
diagrams on q blackboard, which had the merit
IF elucdating the very ditficult subjects.
Tho following gentlemen have been elected
members Of the academy: Professor q. T. ChAnd.
Ter, Of New York, chemist; George Davidson, Of
San Francisco. mathematician and astronomer;
Professor q. q. Marsh, Of New Haven, Conn,
biologist; Geo. w. Hill, Of Nyack, N. Y, mathe-
naticlan; Professor Henry Morton, Of the Stevens
Institute, Hoboken, N. j., physicist.
ented to-day is the report of the grea: telescope
II the United States Naval Observatory, by Pro-
essor s. Newcomb.
Some results Of an examination of the United
states weather maps for the year ls72 by Prof
Prof Bessels, Of the Hall Arctic exploration,
VII submit very interesting paper Of great In
crest to the public.
The session to-day promises to be OF o more In
eresting character than on any previous day OF
he aeademys meetings, and IL is presumed there
Tiil be large attendance Of scientists.