Virginia advocate. [volume] (Charlottesville, Va.) 1827-1860, 1828-08-02

BILE mass of useful information. we extraoa a
few facts MS examples. The cold of I.ouisisnsi in
winter, he says, is more intense than that of Nice
I'm Savoy, while the heat of some part Of the sum-
J mer Is greater than that Of HuYana. In New
orleans, IN the snltry months, the thermometer
often ranges TO ,9S, and 100 degrees of Fahren.
hei!s scale, while lin WRITER it sometimes des-
cends as low as. lG degrees Ulloa relates that he
had seem the Mississippi frozen in that place,
some yards from the shore: We do net belieye.
that any thing of the,kind has been observed. ex-
cept III the winter of 1922, for many wears. He
supposfs the great summer heat of New Orleans
chiefly toaaisei from the levelness Of the surface
Ecf the surrounding country, the depth of the
swamp forest for great distance on all sides the
shghtHess of the breeze that is felt, and the un-
ventilated marshes of woods over which the nor
fhern:breezes float, before they reach that CITY
lNo'cny IN the. world has;so deep an interest IA
-dfaIptbg the swamps, and clearing away the for
tests about itas New Orleans Whea it shall stand
Ike aicfty''p Tignd oss. ~ hA centre ,of widely
! extended and opea plain, II will, 'probaby, be as
neann as other cities in tho same
The following extracts presentsS a,fact, to tile
TRUTH OF which our own feelings have borne testi
mony: e. -. tt ;, .-..ei - = > - - =
Heat intense as it is, does not seem as in 9th.
er countries, to concentrate itselfn the earth and
warm It to certain depth; OH the contrary, the
water OF the Mississippi, taken from the surface.
IS warm. and from Bellows cold. This demon
strates that the heat which prevails in the coun-
try, does not penetrate below, and is accidental
generated by. the absence of wind, or the. action
| oil the sun on Woods marshes and swamps.
Inc effect of great heats is felt in manner
not ac9mrson elsewhere: Inc walking after the
| setting oiltheSsun, one passes suddenly into
muchY hotter atmosphere, than. thafswhich prece.
ded, aud after twenty,o or thirty steps the cooler
ar iss let's as II the .ScOunrys was divided into
bands or zones OF different temperatures. In the
space am hour three ofshese sudden transitions
are perceptblc.< =
ms is not easiIye accounted for. 1t results
probably from the burning oftlfe woods, which
takes place after gathering the CROP andiis one of
thesordinary causes of heat in the air in the di-
rection of the fire. The land being equal in quail
lty and form, 1t cannot be imagined that the rays
Oh thesun are more fixed in one spot than in ano-
liner til likely that some Of the columns of air.
considered horizontally, remain unmoved since
.he setting OF the SUM- and thus preserve the heat
1t communicated, while others set in motion by
ighk or variable wind, lose theirs-These mu-
tauons are perceived when there is no wind
In the fall, which is the most pleasant season
IN Louisiana, and often proongs itself during the
~st winter months, the sky is rcmarkab bly, serene
especially when the wind is southerly. Id Octo.
Der The thermometer frequently rises the seven.
y-eighth degree, which is the greatest heat ia
Spain.
In country, in which the heat Of summer is SO.
great and SO long, it might not lie presumed that
the cold of giuter should be s,4ss~sovere.
as experience shows. Sharp lrosts have occurred
as'eariy as November but their duration at this
period, is extremely short. In the latter part of
February, the mercury has been known to fall
many degrees below the freezing point. But
cold days'are fare in Louisiana, even in winter.
In tbs season, heat succeeds to cold, with such
rapidity, that after three days ofhard frost, as
many generally follow, in which the average heat
OF summer preyails.-p<2S. So
lie remarks, after Ulloa, the phenomenon, that
al certain tunes in the summer, when rains arc
abundant, and thunder loud and frequent, thick
coat OF yellow matter, resembling birthstone,
gathers on surfaces or collections of rain water.
Olioa wtiIneIcaliy supposes itsto be an exhaation
from resinoHs trees, uniting with the ssulplniroIs
part OF the atmosphere, carried along 10y the
winds, aad precipated by the teinpests. This ap.
pearance has given fiset the popular, error, that
it rains sulphur. -
Judge Martin supposes the current of.the Mis-
slssippi IN high water TO descend at the rate. of
SIX miles an hour, AZ low water only at two. We
deem these estimates to be both in extremes He
Imagines that the bed of the Mississippi rises, in
proportion as the banks become higher by depo--
| sltions fromthe overflow Tie proof of this is,
that the planters on the coasts are compelled at
intervals 10 raise their icuees. There is contrary
impression tSt. Louis and St. Charles, in refer
encc to the Mississippi and Missouri in those
points.
There is, also, according TO him, evidence that
the bed of the river rises on the bar at the mouth
The chief pass at the Balize, in 1922, had ac-
l'cording to Ulloa, % feet of water over the bar
In 1867, the same writer found it to be only 20
feet, Swallowing of feet in little more than 40
years. Tor number Of years past, it has been
estirated at liz feet. If the Swallowing of this
bar be thus constantly On the increase. the meal
cuable bearing OF the fact UPON the western COM
mercial interest, ought 70 render 1T subject of
immediate and accurate investigation.
The author barely touches, in passing, at the
estimated insalubrity of New-Oreans lie adj
mItS the desolatons, caused by the frequent yisi-
tatlon OF It's terrible epidemic, at intervals, for
number oil past years. He thinks, however, that
| this unheahness has been overrated and he
might have added the reasonable ground of hope
that the better paving, draining, watering and
improving the city, will still further diminish it.
| lie remarks at the same time, what we have heard
a thousand times asserted, and what seems to be
! verified nv that Y,la yvLr