Chicago eagle. [volume] (Chicago, Ill.) 1889-19??, 1907-01-05
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land many years ago by an explorer,
and has since been watched by sclen.
lists with great Inter st. 1t presents
q white, lnottled appearance In sun
shine, gradually turning from gray to
black as rainstorm approaches. The
stone Is composed of clay, inter and
rock salt. In dry weather the salt In
the stone IL prominent, but when the
air 10 filed with moisture the salt alb.
serbs the moisture and turns black,
thus forming the barometer.
At strasburg, Germany, q dental
clinic has been opened at the university
for the treatment Of school children.
Hitler all the school children are sent,
IN order, BY their teachers. Each child
10 quickly examined, as many a. eighty
children being dealt with In an hour.
and nearly 300 a day, by a single doc.
tor. Teaching goes hand In hand with
treatment. The doctor tells the child
how to use a tooth brush. sees that he
uses one, and sends him home to prac.
tice with 1t. The movement Is spread.
Ing. In wiesbaden and Mulhausen
school dental clinics are to be erected.
Ar.ong the natural curlosities dis
covered by the Belgian exploring expe'
dillon In the country lying between the
basins Of the Congo and the Nile was
wild fg.tree-FlguIer du diable-.
which. having by the chance
Of the winds had Its birth on the sum.
NIT Of an enormous rock Of granite,
and finding no nourishment for its OK.
panding roots near by, sent one long
root In search OF soil down the face
Of the rock until II reached the rich
earth at the bottom. There It buried
Itself In the ground. and thus estab.
lished a chain Of life for the depend.
ent plant above.
Fluid resins or oils from several dif.
ferent trees are extensively used In the
Philippines as varnishes. One Of them,
called oil Of supa, Is a pale yellow
liquid when fresh. but It becomes dark
and viscious after contact with the
air. Spread In thin layer, II dries
slowly and forms hard varnish. II
10 also capable Of being burned In o
lamp. Another natural varnish Is ba.
lao. also called oil Of apitong. 1t Il
white when fresh. but darkens after
exposure, ana makes very tough var.
nish. OH Of panao 10 third variety,
inferior to the others In Its drying
properties. Chemical analysis has
shown that all these wood oils consist
entirely Of hydrocarbons known a
sesQuiterpcnes.
Many Of the scientific journals In
Europe lately have given attention to
. curious discovery reported to the
Paris Academy Of Sciences BY PROBES.
cor Bouchard. This discovery 10 that
under the action Of the X.rays gray
hair, on the head and face Of a patient
treated for lupus. gradually assumed
Ito natural color. and retained II with
surprising tenacity. But only the hair
directly reached by the rays was thui
affected. and II In pointed out that II
would be dangerous to employ such &
method to restore the color Of a per
sons hair. The fact Is regarded al
interesting In itself. but should not bs
accepted as basis for the opera
tons and claims Of Quacks. Professor
Bouchard said that he did not wish Ia
base any practical conclusions upon Il
DR.. Guthnick Of the Royal Observa.
tory at Berlin has recently announced
the result Of his photometric studies
Of elk Of the principal satellites Of Sat.
urn. lilo confirms the previous conclu.
sions Of other observers that several
and perhaps oil, Of these satellites b.
have like our own moon In keeping al.
ways the same side toward tho planet
round which they revolve. In regard
to the satellite named Tethys. he Of.
fers an Interesting hypothesis to nc.
count for Its very marked changes OF
luminosity. His Idea IL that Tethys
possesses the form Of a long ellIpsoid
the two principal axes OF which are
to one another In the ratio OF five to
two. II will be remembered that sim.
liar suggestion has been made concern.
Ing the shape OF the asteroid Eros,
which likewise exhibits great variations
Of light, according to Its position In lts
orbit about the sun.
All the ingenuity that has been EN-
ployed In the past few years In tho In
ycntion Of submarine boats would bt
wasted hut for the means that have
been found to bestow upon the sub
merged vessel, or upon those who navi
gate II, the ability to see what Is go
Ing on upon the surface OF the water
These means are simple In principle
40 they depend only upon the reflection
and conduction OF light, but almost
every nation has Its own methods OF
supplying "eyes" to Its submarine war
boats, and the details are kept NOR,
or less secret. Universally. the appa
ratus comprises a tube rising abov,
the water. and carrying rejecting sur
faces by which the images Of ships ant
other objects above are carried TO tn,
watchful eyes beneath. Mirrors hav,
usually been employed, but the Frencl
navy has substituted for them total
reflection prisms. To vary the lengtl
Of the tube. 20 that Its upper end ma!
be always above the waves, an appara
tus operated by little electric motto
10 employed In the latest modela