The Fulton County news. [volume] (McConnellsburg, Pa.) 1899-current, 1906-05-02

The latent image-the undeveloped
photograph-is an eectro-chemical for
nation of molecular nuclei around
which the visible image is srbseuuent
ly built up by development.
When the glass plate of a photo.
graphic negative Is scraped free from
film and cleaned chemically. nothing
remains visible. but on breathing on
the glass the Photographic image NAV
be brought out again as a faint gray
and white positive.
Twice as much heat is generated by
X-rays in lead as in zinc. The only
explanation evident to the discoyerer
is that certain elements are broken un
by these rays. and that the energy lib.
Grated from these atoms forms a part
of that appearing whcn the rays are
absorbed by matter.
The automatic gas kinder and ex.
tlnguished of Herr Raupp, of Mayence
/ based upon the singular effect of
light in increasing the electric conduc.
tivity of selenium With the coming Of
daylight, the selenium permits the
ready passage CT an electric current
and this causes the shutting off of the
gas, which the apparatus turns on
again and ignites as darkness comes
again. The selenum, of course, is
shielded from the light of the burning
gas.
The powers of the stomach have
been gagged hitherto by means of a
test breakfast and the subsequent use
of the stomach pump, or less directly
by chemical test of the urine. A new
method is being tried in Europe by
DR.. Schwartz. He administers large
pill of a third or a half ounce of sub
nitrate of blsmuth enclosed in a coat
ing of connective tissue from the sheep
or OK, and when examination is then
made with X-rays, this subsequent aa
made with X-rays, this substance
shows as a dark shadow At first it
appears as. deep black spot. AS di
gestion progresses, however, it dis.
seminates through the stomach. and in
health gives faint shadow of the en-.
tire organ in about seven hours. In
such disorders as deficiency of acid
pyloric disease and cancer the black
spot persists nine, eleven or even TWEEN.
ty hours, while in hyperacldty the
too rapid digestion may cause the spot
to disappear in two to five hours.
A toxine of the blood of eels and al.
lied species, preventing coagulation of
poisoned blood, was discovered by NJ.
Mosso as long ago Gs 1889. The toxine
has not yet been isolated. but late in
yestigators have found that the eel
serum retains its toxic power for q
considerable time in the dark, but that
the degree of toXicity varies with the
individual eel and with the season.
Like snake venom, the toxine appears
TO be active only when entering the
blood, being harmless when swallowed.
An anti-toxine can be produced in the
blood serum of susceptible animals,
and this lenders rabbits and goats i'm.
mune against great doses, though lit,
tie effect is produced ON gulne pigs.
Experiments made by G.. f. Becker
and A. l.. Day on the linear force ex-
erted by growing crystals have brought
out interesting facts. They found that
crystals of alum are able to form in
saturated solution, in opposition to the
pressure of heavy weight. whicn
they must lift. This linear force of
growing crystals is of geologic impor
tance, for it has been found that py-
rltic crystals formed in slate rock are
able to drive apart the laminae of the
rock without any perceptibe deforma-
tion of the crystals.