Great Gas NIicroscODe.
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The public is not generally aware that the most
splendid and powerful instrument of this class that
art or science has ever produced, Is now in our
city 1t may be recolleced that some two or
three years ago microscopic apparatus constructed
by Carey for the Polytechnic Institution of Lon
don, produced great sensation in that city, and
has continued ever since a constant object of at
traction This instrument was reported 10 be ca
pable Of exhibiting flea, thirty feet in length,
preserving the necessary dstinctness, in the mi
nutest parts, and sufficient illumination That an
paratus was then the largest and most powerful
that had ever been constructed. On ascertaining
the success OF this attempt, Dr. Lardner sent direc
tons to Messrs Carey to construct for his lectures
and scientific exhibitions ia this country an appa-
ratus not inferior IN any respect TO the polytechnic
instrument, but having advantages over il in some
points IN which It appeared susceptible Of improve
ment The present apparatus, which arrived here
few months since, was the result Of this order.
II Is at present erected in the room of the Society
Library in Broadway, where, to Judge by external
indications, permanent place Of scientific exhi-
btion and popular lectures is contemplated, some
what similar TO the Polytechnic Institution, or Ade-
aide Gallery In London, to be carried on under
the direction and superintendencc of DIR. Lardner,
who will, II IS understood, give il the frequent ad
dinonal advantage and attraction OF his lectures.


Inc present microscopic apparatus possesses ca
pabilltles and powers even greater than those as
cribed to the London instrument. On "Wednesday
evening the flea was shown with it forty fue feet IN
lengm. each leg measuring about twelve feet, the
mlnute hairy OF spicular emanations upon it being
a foot long, and perfectly distinct The bug was
also exhibited, the head OF the creature being Sc
yeral feet in diameter, and each eye measuring
foot! We shall prepare a description of the optical
mechanism by which these astonishing effects are
produced, and publish it in a day or two.


A handsome frame and entabature was erected
on Saturday over the porch Of the Library Society
House, enclosing the following inscriptions


DR.. LARDNERs LvCEUM


GREAT GAS MGR OSCOPE
Telescope and Pictorial Exhibition.


This indicates permanency. DR.. Lardner will
exhibit the microscope, and give one Of his popular
lectures this evening.