The Londonderry sifter. (South Londonderry, Vt.) 1883-19??, 1886-10-07
POPULAR SCIENCE.

Bees are said to have such an antipathy
to dark colored OBJ jects that black chick
ems have been stung to death while the
VIII te ones of the same brood were un-
touched, and man in black plug hat
is rarely stung on account OF the atten'
tion the bees give to the hat.
German photographers have succeeded
in photographing a projectile in the
course of its flight, and some of these
photographs show the head of condensed
air which precedes every shot. 1t is said
to be this "head" which prevents even
slilful rihemcn from hitting an empty
egg shell when hung on long thread.
The air blows the shell out of the way of
the bullet
DR.. Laptchinkski has been making a
series of experiments upon dogs, for the
purpose of ascertaining the proper treat
ment of persons who have been frozen.
He found that of twenty animals treated
by the method of gradual resuscitation
in a cold room fourteen perished; OF
twenty placed at once in warm room,
eight died; while twenty put immedi-
ately into hot bath recovered quickly
and without accident.
The great force exerted by growing
plants nay be demonstrated by direct
measurement Ry an arrangement OF
harness and levers, President Clarke, of
Amherst Agricultural College, made a
growing squash register pressure equal
to thousands of pounds, when finally
the harness broke. A tree in a grave
yard at Hanover, Germany has lifted
more than five inches block of stone
containing twenty cubic feet,
There is on exhibition in jewelry
store at Washington very unique cleo
trical time piece. The face, or indica or,
of the clock is suspended by two cords,
and the electric apparatus, which Is the
motive power, hangs by a wire in tho
bottom Of the window. The clock works
silently, and it has been tested and proves
to keep accurate time. No clock work
of any kind is attached to the time
keeper, except the hands, which move
only each minute.
The great glacier of Alaska is said to
be moving at the rate of quarter OF
mile per annum toward the sea. The
front presents wall of ice some 500 feet
in thickness; its breadth varies from
three to ten miles, and it is abont 15O
miles long. Almost every quarter Of an
hour hundreds of tons of ice, in large
blocks, fall into the sea, which they agi-
tate in the most violent manner, the
waves being such as to toss about the
largest vessels that approach the glacier
as if they were small boats.
The air of the sea, taken at great dis
tance from land, or even on the shore end
in ports when the wind blows from the
open, is in an almost perfect state of pur-
itv. Near continents the land winds
drive before them an atmosphere always
impure, but at 1G0 kilometres from the
coasts this impurity has disappeared. The
sea rapidly purifes the pestilential at
mosphere of continents, hence every ex-
panse of water of certain breadth becomes
an absolute obstacle to the propagation
of epidemics. Marine atmospheres driven
upon land purify sensibly the air of the
regions which they traverse.
Investigation shows that the limits OF
| temperature at which men can work de-
pends upon the length of their exposure,
the amount of excrtion they put forth,
/ their condition and the nature of the
atmosphere, particularly as to its degrees
! of moisture. 1t is stated men have been
employed on railways at 10i Q; in mines,
under very favorable conditions. at 125 Q.
! and are said to work occa>ion lily in the
! stoke hole of tropical steamers ot 156 .
! Professor Dubois is reported to have es
timated that temperature of 122 . car
4 be endured when the air is as dry as pos
sible, but that even 10to is likely to bt
fatal in an atmosphere saturated with
moisture. 1t is also considered certain tha
i men cannot become accustomed 10 stand
for any considerable time higher tenn
perature than from l45 10 165 ., ever
when they keep perfe ,tly still and are il
quite pure air.