The Douglas independent. [volume] (Roseburg, Or.) 187?-1885, 1880-11-06
Science for the People.

According to DIR. w. NJ. Hudson, one
Of the fish commissioners of Connecticut,
81, 900 young Penobscot salmon. matched
last spring ct the Matching house OF Po-
quonnock, have been placed in the
Harrington river and its tributaries. OF
land locked salmon eggs from Grand
Lake stream, Eastern Maine, 81 900 were
Matched and distributed. The demand
for these young salmon to be used in
stocking ponds and streams has been
very great. From the eggs introduced
by the commission four years ago, sal
mon weighing from two and half to
four pounds each have been taken in
Hog pond, in Lyme, in Snipsic pond, in
Rockville, in Long pond, in Winchester,
and in Twin lakes, in Salisbury, and in
many others the young fish are said to
be growing and thriving finely. The
young salmon were this year sent to all
parts of the State and put into such lakes,
ponds and streams as seemed adapted to
their wants.
Brook trout to the number of lie, 900
were Matched and distributed, and even
this large number was insufficient to sup
ply the demand. Arrangements have
been made to secure 400, 900 young fry
next spring. Regarding the experiment
of Matching young shad in the waters OF
the Sound by artificial means, DIR. Hud-
son says With the exception of O few
thousand young shad Matched at Weth-
ersfeld the operation was failure The
shad taken were found to be immature,
and any attempt to preserve them until
ripe in fresh water resulted in their
ToI
bridge, of Harvard, has been studying
the spreading of the electric current from
the grounded terminals of battery in
connection with the time signal service
from Cambridge to Boston and the vari-
GUS wires of the telephone company. As
one result he announces that it is possi-
BILE to-day to telegraph across the
Atlantic ocean without a cable. Power
full dynamo-electric machines could be
placed at some point in Nova Scotia, hav-
ing one end Of their circuit grounded
near them and the other end grounded
in Florida, the conducting wire con-
sisting of wire of great conductivity
and carefully insulated from the earth,
except at the two grounds. By explor-
ing the coast of France, two points on
two surface lines, not at the same time
potential could be found; and by means
of telephone of low resistance, the
Morse signals sent from Nova Scotia to
Florida could be heard in France.
Theoretically, Mr.. Trowbridge says, this
is possible; but practically, with the
light of our present knowledge, the ex-
penditure of energy on the dynamo
electric engines would seem to be enor
mons.
A simple method of determining the
temporary hardness of water has been
lately described by Herr Wharton to
the Berlin Chemical Society. A tube
about 30 to 80 ctm. long is used; and
near its rounded end is mark denoting
10 cub. ctm. From this mark to the
mouth, the tube is divided into O. /
! cub. ctm. Water is put in up to the
lowest mark, and with it small piece of
filtering paper which has been saturated
with logwood extract and dried; this
makes the water violet. Then normal
muriatic acid is added fran drop flask,
till the color of the liquid ap-
proaches orange. The thumb is then
placed on the mouth of the tube, and the
latter is shaken, whereby most of the
carbonic acid is liberated, and the liquid
becomes red again. (The removal of the
carbonie acid may be promoted by blow
ing into the tube after each shaking. J
More acid is added, and the action re-
peated, with weaker effect, and at length
the color of the liquid is changed to a
bright citron-yellow. The amount of
acid used is then read off ON the tube.
With these simple materials the alkalin-
ity of series of springs or wells may be
examined duriney a WALL