The Cheyenne daily leader. [volume] (Cheyenne, Wyo.) 1870-1884, 1881-05-22
Weekly Leader,
ISSUED ETERT
Ter.s, 90 8 year, sIss Hair Year.
SCIENTIFIC.

The tea plants grown by Count
d'Amigoo on his estate near Messina, pro-
duce leaves which are said to be as good
as those of the plants raised in China.
There is to be q systematic attempt now
made to grow the tea on a commercial
scale.
A Mr.. st. George Lane Fox has been
working on an electric lamp on the
same principle as Mr.. Edison's, and it
would seem from q report of q private
exhibition of the efficiency of this lamp
that Mr. Fox has been very successful.
The tests were made, at the office of the
BRITISH Electric Light company, Lon
don. 1t is claimed that the Fox in
candescent lamp win last for years if
subjected ''to ordinary average use"
The largest terpedo-boat in existence
las lately been launched at Copen-
hagen. She is called the Nordenskiold.
and measures 215 feet in length and AZ
feet in breadth. Her displacement is
OF 2,500-horse power. it is expected shc
will sail at the rate of fifteen miles al
hour. Her armor is of steel, and is
four inches thick. She isto carry the
heaviest breechloading Krupp gun eve,
borne by any ship of war in the Baltic.
Amaterial which has been propose
Tor the filtering and d~ecolorizing o
sugar and other. substances consists o
diied or baked graduated clay mixed
with blood in the p~roportion of three
parts of clay to -four of blood. Some
times vegetable charcoal is added. The
mixture IS nodded into Jumps of any con
venient form. died. broken into small
pieces. mixed with an equal bulk OF:
graduated clay, and after having been
carbonized in a retort, CAREFUL ,
screened The screenings are said 10
answer admirably the purpose for which.
they are designed.
Some French physicists contend thai
Bell in disks of mica, india-rubber.
metal. and wood. by holding them in
the path of a rapidly interrupted beam
to light Even a plate Of copper heated
musical notes. which died gradually
away as the plate cooled to a dull red.
Disks coated with silver on the side ex-
posed to the ray gave very feeble sounds.
but when coated with lamp-black the
sounds were strong.
MI. Covers form of the Bell teh.,
phone has been adopted by the British
postoffice authorities. who have given
an order for twenty thousand of the in
struments. 1t has been tried ON the
Southwestern railway, England, with
much satisfaction in communicating
with the signal cabins on different sec
tions of the line. The telephones were
simply connected between the existing
wire for working the block system
and the ssearth." Conversation was
then distinctly carried on without inter-
fering in the least with the ordinary
signals. 1t was interesting to hear
through the telephone the sound of the
train itself leaving the distant station II
the same time as the strokes of the sig
nal bell announced the departure.
, An interesting analysis of the various
modes Of sensibility Of the visual ap.
paratus, the London Ismes reports, has
boon made by Mr.. Chambers. HS has
been experimenting by lookingi in dark
ness at an opaque screen in which was
perforated three or four minute holes,
quite near each other. but distinguisha-
BILE when = medium light shone through.
Light was raised from zero on the othor
side; it was sometimes colored. The
order Of phenomena was proved to be
this: The first action of light entering
the eye in very small quantity is in all
cases merely to produce a diffnse lumin.
Gus sensation not differentiated either
as to color OF as to form; with agreater
quantity n gets the notion Of color.
Il there be color in the light; and still
moro light is required TO be able 70
resolve the luminous object into its
different elements. Luminous sensibil.
ity is tho most simple reaction; then
comes chromatic sensibility. by which
we distinguish color. and lastly. what
the author terms visual sensibility, by
which we distinguish form ~1