News by Mails.

From the Baltimore Sun.
THE DRUMMOND LIGHT.
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A correspondent at Washington furnishes
u with the following synopsis Of the report of
the COMMITTEES Of Congress in favor Of light
ing the Hall of the House Of Representatives
with the Drummond light:


4" The committee, after some preliminary
remarks, report ss that this light Is popularity
known as the Drummond Lights, aud is pro-
duced by the uniting Of two jets Of Oxygen
and Hydrogen gas, upon piece Of unslacked
calcined lime, 10 a state Of combustion. Ii
has been ascortained by accurate measure
ment, that the light possesses an Illuminating
power, taking the magnitude Of flame as
base of calculation, equal to siz hundred oil
lights, from the best Argand burners. The
cost Of this light has been, from repeated ex-
periments, ascertained to be but one-fourth
the cost Of oil lights. Its power of continual
tioh is equal to auy light known.


This light has been shown in the Hall OF
Representatives., and completely eclipsed the
laa'ps and candles, then thrown into contrast,
both IN the brllIancy and purity of light emit
ted. The penetrating power Of this light is
also one Of its chief attractions, as every part
Of the Hal! was equally illuminated from the
door to the ceiling, while lamp aud candle
light form stnal! nucleus Of light leaving the
exterior partly in the shade.


Among the important consideration your
commlttea have i'll view in introducing this
light. is the preservation Of the purity of the
atmosphere i'll the House, which is now con-
taminaied aud heated with the smoke and
flame of lamps and candles to degree very
H.! !ur ious to the health and comort Of members
during night sessions.


The cost Of illuminating the Hall per night
ia by this process reduced 10 eighth of the
present outlay. thereby saving twenty-five
dollars per night to tho Cove, nment. which
alone would pay for the apparatus in few
years."


The PoroMAc FIsHESIEs.-A. the Alex
andria fish wharf, the great depo, Of the
Potomac fisheries, shad were selling yesier-
day, by the cargo, at 81 per hundred, retail
$s; herrings, by the cargo. So, retail So 25
per thousand. Thcre is large and increas-
ing demand, aud the supply is moderate.
Wagons from distance have come in this
season very early. We learn that in three
hanls yesterday, at the landing near the Long
Bridge, 1850 fine shad were caught. .-.4ler.
Gaxeiic.