The Londonderry sifter. (South Londonderry, Vt.) 1883-19??, 1889-11-28
SCIENTIFIC AND INDUSTRIAL.

a scientist states that medical science
is keeping alive unhealthy people to breed
unhealthy children.
Sir William Gull says that when tagged
out by professional work he recruits his
strength by eating raisins, and not by
drinking wine or brandy.
The disinfccting power of animal gas
is such that when introduced into sewage
it very quickly destroys the microbes Of
putrafaction and of many diseases.
Hollow bricks are coming into very
general use in building. They crush at
10000 pounds and cost one-third less
than the ordinary form, while making
the walls proof against fire, moisture and
frost.
While the use of electricity in London
for illumination is steadily increasing, the
use of gas is also rapidly on the increase,
the demand for the latter for heating and
cooking being greatly in excess of former
years.
A planter in South Carolina has sue
ceeded in propagating the male cotton
plant by itself, until he now can raise
cotton seed without the lint or cotton
The gain appears t be in the increased
yield of seed.
1t is known that the bellows were used
in Egypt in the time of Totnmes ILL.,,
one of the Pharaohs 1890 B. C. From
picture on tomb of that date bellows
made of leather bags, worked by men
standing upon them, are shown.
The two sides of the face are by no
means alike. AS rule, the want of
symmetry is confined to the upper part of
the face. Among other singular eccen-
tricities is the fact that the right ear is
almost invariably higher than the left
Fish-meat does not contain more phos-
phorous than ordinary butchers meat
The benefit which brain-workers are said
to derive from diet of fish should there.
fore be ascribed, not to the phosphorus,
but to the greater digestibility of the
fish.
An electric bell-buoy is proposed, one
Of its chief attributes being that the
action of salt water produces current
sufficiently strong to ring a bell. A
secondary bell, to be rung in rough
weather, is also an attachment to the
buoy.
The manufacture of sugar by the diffu-
sion process in Louisiana has resulted in
great increase of output. Moreover,
there is already growing up more
scientific agriculture, .,.
of the problems of sug rre-.... F.. .
more scientific meth
house, and the introdu .n.. ..
machinery.
A Dutch physician -~.--.s
close connection exists between the exer-
else of mental faculties and disorders of
the nose. He says that if it were gener-
ally known how many cases of chronic
headache, of inability to learn or to per-
form mental work, where due to chronic
disease of the nose, many of them would
be easily cured.
Extralite is the name Of new ex-
plosive patented by Rudolph Ericsson,
young Swede. 1t is claimed by its in
ventor to be not only of great power, but
also to be absolutely harmless when not
properly confined in an air tight and
rigid receptacle. The extraiite is an in
nocent- looking granulated substance of
about the color and general appearance
of coarse corn meal.
The Elektrotechnische Echo is response
BILE for the following explanation of why
oaks are more frequently struck by
lightning than beech trees. The leaves
of the beech tree are, it seems, covered
with fine down, which is better con-
ductor of electricity than the smooth
leaves of the oak. According to the
same journal, experiments with dis
charges from influence machines tend to
confirm this theory.
In the new process of making white
lead the ore as it comes from the mine is
volatilized and oxidized by the air, the
fumes are condensed in a slightly acid
liquor, and the resulting sludge is washed
and dried for the market without having
been touched by the men. Quickness of
manufacture, starting with ore and not
with the purified metal, and avoidance
of danger to tie workmen, are among
the advantages of the new system.
Cement should never be disturbed af-
ter commencing to So 1t should be
kept moist and wet until hard. Cold re-
tards, heat quickens settings. Brick OF
stone should be wet or moist, or cement
will not adhere well. Portland cement
requires less water than natural or
American cements. 1t sets in from three
to twelve hours. 1t must be kept dry,
or it will become lumpy and spoiled. 1t
need never be used pure, but should al