The Opelousas courier., 1901-02-09
LOUISIANA.
POPULAR SCIENCE


POPULAR SCIENCE
James Camille, F. r. c. s.. recognize:
light types Of piague-namely, the blu
bonic. the septicaemic, the pneumonia
he nervous, the toxic or fulminant
!he puerperal, and the two mild types
Iestis ambulans and pests minor.
An Italian inventor has made q pic
Hlre postal card with changing colors
similar TO the shot silks worn by Ia
lies, which: at different angles reflect
aifferent colors. Not only do these
:olored pictures change under varying
conditions Of the atmosphere, but their
changing foreshadows a change Of
weather.
NM. Desgrez and Balthazard, Of
Paris, have been carrying out some
elaborate experiments with the object
If regeneratfng respirable air in a con-
ined space. and have communicated
he results of their researches to the
Academy. Of Sciences. They hare con-
Itructed a diving dress Of aluminium
which weighs in all about twenty-five
POUNDS. Inside this dress they place
quantity Of bioxide Of sodium, and
diver wearing this apparatus can
walk about for a considerable length
Il time under water, without coming
% the surface to replenish his supply
" air. 1t is claimed that the inven-
ion will be of inestimable value TO
persons engaged in mines, chemical
Industries, or to reach certain points
surrounded by a poisonous atmos-
phere.
It is not an easy matter to obtain
he temperature Of very big living
animals, especially when the animals
n question are not domesticated, and
10 far it has been utterly impossible
% get the exact temperature Of q live
whale. But something nearly as good
las been done. 1t is known that the
blood of a whale cools very quickly
after death, and experiments have
been made in Norway which have. re-
'ulted in taking the temperature Fpon
after death. Mr.. Guldberg, who has
made the experiments, says that, ow-
ng to the very thick coating Of fat Of
The whale, there is in three days but
/ very slight cooling. Recently he took
.h0 OnAps0 frrrn re n uyhn1n ryhfoJ hnT
been lying dead for three days, and
found 1t to be "a degrees Centigrade.
From whales of different species which
had been only just killed he has gotten
he following temperatures: Sperma-
ceti whale. 40 degrees; Greenland
whale, 1873 degrees; porpoise, 1913 de-
grees; dolphin, $3.50 degrees.
]. Hahn has recently conducted an in
vestigation dealing with the relation
between solar activity and the secular
variation of the earth's elements. He
thus sums up his conclusions in a re.
cent article in Nature: ~ That the
changes In the motion of the pole of
rotation round the pole Of figure are
In intimate connection with the varia-
tons Of the electromagnetic forces; e.
lnasmuch as the latter phenomena are
In a close relation with the state Of
solar activity, the motion of the pole
ls also indirectly dependent on the
1ynamical changes taking place at the
SUMS surface; 81 the distance between
the instantaneous and mean poles de-
creases with increasing intensity Of
sarth-magnetic disturbance; az the
length Of the period Of latitude varia-
ton increases with increasing inten-
sity of earth-magnetic disturbance; 81
In strict analogy with the phenomena
Of nUrorae and Of the magnetic dis
turbance, the influence of the eleven
years period of sunspots. as well as of
the great period, is clearly exhibited
In the phenomenon of latitude varia-
ton, and the same d~eviations from the
solar curve as are manifested by the
aurorae are also evident in the motion
Of the pole; (6) the half-yearly period of
the electromagnetic phenomena infu-
ences the motion Of the pole of 70.
tation In such a way that its path, in
stead Of being circular, assumes the
form OF an eclipse, having the mean
pole at its centre; 81 the h~alf-yearly
period also explains the conspicuous
fact of q rotation Of the axes of the
eclipse in O direction opposite to that
OF the motion of the pole.