The daily Cairo bulletin. (Cairo, Ill.) 1878-1???, 1880-12-29
POPULAR SCIENCE

The presence Of iodine in Curacao
guano has been proved by Ii. Steticrs.
When mass Of the guano was sub
cctcd to \ heat Of from ITO to 100 de-
grccs e tho soluble yapors Of iodine
were given oil.
When bars of magnetic nature are
compressed, twisted, or stretched they
have a tendency, says NJ. Adler, TO re-
sumo their primitive molecular dispo-
sition when they arc subjected to tho
action Of q magnctiziny current.
Fourteen new elementary bodies,
classcd rs metals, are announced to
have been discovered within the past
two years. Prof. 7. ). llumpidsc
throws grave doubts on tho reality OF
the discovery of any one Of them, and
insists upon more accurate and cruel
cal tests on the part of chemists.
About ono in every thirty adult
males and Que in every fifteen females,
says Mr.. +. Gallon, whenever they
think Of numerals, sec them III vidid
mental picture, aud each number al
ways occupies the same relative posi-
tion in their field of view
The following mixture is recon-
mended for the destruction OF para
sites OF plants Boracic acid, 10 parts;
salicylic acid, 5 parts; rcctiilcd spir-
its, 90 parts, and water 200 parts. The
liquid is applied by means Of spray
produced.
An insect called nccn, Of the cocus
species, has been discovered III the dis
| tIict OF Yucatan, Central America,
which is capable of producing q spc-
cies of india rubber. From the bodies
of mems an oil exudes which has q
high reputation for its curative prop
critics. Exposed to heat it yolatllizcs,
leaving q tough wax, which, when
| burned, produces q thick scmi-huld
mass like d solution OF indla-ItIbber.
This simple method Of making a
phosphorescent lamp is given: Cleanse
| oyster shells by well washing, expose
them TO red heat for halt an hour,
separate the cleanest parts, and put
| into q cruciblc in alternate layers
with sulphur. Then heat to red
ness for AT least all hour. When cold,
| break the mass, and separate the whit
est part for use. Ii incloscd in bot
tic The figures Of q watch may be seen
by the aid OF tho light emitted. To
renew the luminosity Of the mass, en-
bose the bottle each day to the sun or
other strong light. The sulphide Of
calcium will thus be made to absorb
light, which will DC available through
out the night.
DR.. Stone, says Engineering, recent
" exhib. ted an interesting electro
magnet of novel construction, based
on principle which will probably
be applied with advantage IN making
electromagnetic for dynamo-elcctric
machines and Geographic apparatus.
1t is known that cleo magnets IN
closed in jackets of soft iron are Tar
more powerful than when the wire Of
the coil is uniucloscd. Dr. Stone does
not employ soft iron jacket, but III.
stead ot using copper wire to wind
the bobbins he uses the best charcoal
aunea!ed iron wire, about one-iitth
| men III uI1llltlcI. Jul W llCS tlO
wound on in parallel circuits, and the
current j. spit up among them IN
multiple arc" They aru insulated
from each other by palaiHue wax. BY
Til, arrangement the lifting power OF
DE- stones large magnet Is, with a
battery Of five or six Buusea cells, ILL.,
creased touriold.
Some of the finest prehistoric re-
mains in Italy have lately been dug
UP by Prof. Prosdooislni in an AN
Gent cemetery lately discovered near
the town of Este. The Romans had
long years ago rifed some Of the
tomDs, but many places OF interment
were found to be undisturbed, and
they contained some valuable stores
of pottery and bronze. The ornamen-
tation, as well rs the modelling OF
some Of the pottery, is considered 10
be very fine. Great interest has been
excited by the figures on the broilzeS