Richmond dispatch. [volume] (Richmond, Va.) 1884-1903, 1884-12-31
Scientific Notes,

IL ten par's OF colOdion are added to tif-
teen parts OF creosote a sort OF Jelly Is OBJ
tanned which is more convenient to apply
10 decayed teeth than creosote in the liquid
form.
NM. ii. Fol and Z. Tarasin have ascef-
tanned that sunlight penetrates the waters
Of The lake OF Geneva to a depth OF 10
meters, where the luminosity is about equal
TO that Of clear, mooness night.
The Oldest geographical society in Eu-
rope is the Cosmographic Society. OF MI
remLerg. Ii was established about 1740,
and first came before the public in 17i6 1t
was connected with the Holman institution,
in the same city.
At meeting Of the Royal Geological So
cieiy, OF Cornwall, England, Professor
Warrington SMITH drew attention TO the
temperature OF deep mines, especially those
OF Nevada. the great heat OF which he as
cribed TO chemical changes going on in the
lode itself.
1t Is reported that Professor o. Sars. OF
Christiana, received two years ago some
mud taken from the bottom OF an Austria
liam lake by Norwegian geologist. Re-
Gently he placed the mud in small aqIarii
and succeeded in producing from it quite a
fauna of Australian fresh water inverte-
braies.
Tobacco plantations in Southern Hungary
have sustained great damage from the wire
worm. This destructive pest enters the
stem OF the tobacco-plant Just above the
root and works its way upward to the
flowers. Plants thus attacked yield no to-
bacco. as the leaves turn yellow, and very
soon all fall of.
vaseline is said to be good preseryative
for eggs. The vaselne is melted with . per
cent. OF salcylic acid, and rubbed on the
eggs after they are thoroughly washed.
The coating so given may be renewed after
awhile. As the air is thus thoroughly ex-
cluded, the eggs. II they are fresh to begin
with, ought to keep good for long time.
Mr.. w. II. Preece says that his expert
ments have proved that the luminous pow
ar Of an electric glow lamp increases as the
sixth power of the intensity OF the current.
AS the energy expended increases only as
the square or the intensity, the luminous
power varies rs the cube OF the energy ex-
pands; but the duration or life OF the
lamps dimiDishes rapidly with the increase
of light.
Rolled gold Is thus manufactured An
ingot OF brass is cast. and while II Is yet
hot thin layer of gold alloy is poured
upon 1t. When the iDgot thus covered be-
comes cold ii Is forced between steel rollers
until long, thin ribbon Is produced, Of
which the proportion Of gold and brass Is,
Of course, The same as that Of the ingot.
The percentage Of gold is often reduced
very Iow-sometimes to 2 and per cent.
This rolled gold in cheap bracelets and
watch.chalns lasts for ten years.
Soil covered with living heritage. or with
such dead vegetable matter a. leaves. straw,
wood, &C., says Professor Il. Wollny, il
warmer In winter and cooler In summer
than bare soil under similar conditions.
The difference OF temperature Is greatest
in summer and least in spring and autumn.
Bare soil heats more quickly In spring and
cools more quickly In autumn than that
covered with living or dead vegetable mat
ter. The fluctuations OF temperature are
much smaller IN covered than In bare soil.
The absolute intensity Of magnetic or
electromagnetic field has been for some
years measured BY NJ. Henri Becquerel by
noting the rotation OF the plane OF polariza-
ton 10 the light traversing a body placed
in the deld. 1t Is sand that the indications
Of his apparatus are instantaneous; that
the optical measurement Is readily made
with great precision; that an instrument
for absolute measurement can be easily
constructed, and that the method can be
applied to very weak rs well a. very strong
currents.