The daily Cairo bulletin. (Cairo, Ill.) 1878-1???, 1881-01-18
THE DAILY BULLETIN.
POPULAR SCIENCE.


heavy doses TO mammals, acts, accord
ing to M. Richet, partly like chloral
and partly like curare.
Adolf Mayer has discovered that
oxygen has no direct influence upon
fermentation. When Professionally
drogen tartlale was added to strong
syrup containing yeast, the cells OF
the yeast grew rapidly and the fer
mentation was easily accomplished.
Precipitated silica attracts and fixes
aniline colors, turkey red much better
on fabrics than siicous inlusoral earth,
but, argues a writer in Remnants
FarJer Zettung, in opposition to En-
gel, these properties Of SILICA cannot
be due TO capillarity, because, Of the
two substances, the iniusorial earth
can only be said to possess capillarity.
Gamboge is the hardened juice Of
tree very common in siam, Cochin
China and Ceylon. The trees arc tap
ped and the sap or juice is caught in
cocoanut shells and put into large
earthen vessels to thicken. Before it
is hard it is poured into hollow joints
ofbamboo, where ii hardens intoround
sticks, though it is sometimes made in
other shapes. The best gamboge is Of
orange color, dark yellow when dry,
but producing a bright yellow when
rubbed in water. 1t is used in medi-
cine and as a paint. The word gam
boge or cambogc comes from Cambo-
dia, the name of the country from
whence it was first brought.
In a paper on the earth as a conduc-
tor of electricity, Prof. Trowbridgc,
or Harvard, arrives at these conclu-
sions: |. Disturbances in telephone
circuits usually attributed 10 effects
Of induction are in general rule due to
contiguous grounds Of battery circuits.
A return wire is the only way to OBJ
vate these disturbances. 2. The we'll
tined equipotential surfaces in the
neighborhood Of battery grounds
shows the theoretical possibility of
tclegraphing across large bodies OF
water without the employment OF a
cable; and leads us TO extend greatly
the practical limit set by Steinheil. 3.
Earth circuits have an intermittent
character, with periods of maxima
and minima, which may occur several
times minute during the day. ms
Intermittent character is seldom absent.
Lord Rayleigh has described plan
for demonstrating that yellow color
can be formed by combining red and
blue. lie mixes a red solution Of
chromatc of potash with blue solu-
ton OF litmus, and, on filling it into a
glass cell of certain thickness, the
light transmitted through it seems to
be yellow. Plates of glass coated with
.elatine impregnated with chromate
of potash, placed side by side with
plates coated with gelatine impreg-
mated with litmus, also transmit yell
low light. Lord Rayleigh finds, how
ever, that the eyes Of different persons
vary considerably i'll their power OF
approaching the tinge Of the trans
niittcd yellow but this has nothing
TO do with olor-blindness, since all
the persons tested could distinguish at
once the components with accuracy.
Two new preservative wrapping-pa-
pers have been recently brought out,
one designed for fruit and one for
iurs, cloths, etc. The first is made by
dipping soft tissue-paper in bath
of salycilic acid and hanging it in the
air - dry The bath should be made
from a strong alcoholic solution OF sal
ycilic acid, diluted with rs much wa
ter as it will bear without precipita-
ton. The apples, oranges, or other
fruit may be wrapped in the paper
before packing and when the fruit
reaches its market the paper can be re-
moved and used again. A manila
wrapping paper may be prepared lol
resisting moths and mildew by dip
ping it IN a prepared bath, squeezing
it and drying it over hot rollers. This
bath is made by mixing seventy parts
of the oil removed by the Installation
OF coal tar naphtha, live part, OF crude
carOollc acid containing at least % per
cent of phenola, twenty parts OF thin
coal tar at loo deg. Fair, and five
,,orts Of rotnoJ ,,ntrnlnum