The Manitowoc pilot. [volume] (Manitowoc, Wis.) 1859-1932, 1908-05-07

Owing TO the great amount of decom-
posed vegetable matter contained in
Brazilian waters, which causes rapid
deterioration Of thin steel, the hull
of the new dispatch boat Guanabara,
built for the Brazilian Government, is
constructed entirely of bronze. Against
this metal, says Popular Mechanics, the
corrosive action of the Brazilian waters
has no effect, and, although more cost
ly, both in material and construction
the vessel is much lighter than If built
OF steel or wood. The propeller shaft
Ing and propeller are also of bronze.
The brOwnish spots which appear in
old books are really due to the ravages
or bacteria. says Popular Mechanics.
The tiny destroyer Is especially fond OF
starchy material and its propagation is
promoted by damp 1t has been we'll
understood that damp produced discol-
Grafton and decay, but the share of the
microbe in the operation has not hith-
erto been suspected. Tiny fungus or
mold is responsible for gray and black
marks upon old papers. In spotting
the surface the fungus helps to break
down the fabric and hasten the process
of its destruction.
II. Lydekker, the English naturalist,
calls attention to the observations of
X. |. pocock on the significance of the
spots on lion cubs as indicating the
close relationship of lions. tigers and
leopards. On lion cubs the pattern of
The markings is intermediate In char
acter between the stripes of the tiger
and the rosettes Of the leopard, but in
clines more toward the former. East
African lions retain more or less dis
ttnct traces Of these early markings
even when they reach maturity. A dis
tinct tiger-like feature Of the lion cub
is white patch over the eye. which
disappears in the adult. Puma cubs
show a pattern quite unlike that of the
lion, tiger, leopard and iaguar.
At the recent meeting of the Amer-
can Association Tor the Advancement
of Science, in Chicago, attention was
called to the interesting fact that the
work on the Panama Canal is changing
biological conditions in Panama. and
that its completion will enable the
freSh-water faunp Of the Atlantic and
Pacific slopes to intermngle Undoubt-
edly many marine animals will pass
from one ocean to the other. Thus n
permanent change of conditions will be
brought about, which may or may not
possess much practical Importance. but
It's scientific interest is very great In
view of these facts, the association re-
solved to urge upon Congress the neces-
sity or an immediate biological survey
of the Panama Canal zone
The report that the Gulf Stream now
runs with greater speed than formerly.
and its influence on the time reoulred
for the crossing of the Atlantic fur
nishes the theme for an article by DR.
Brennecke in the German magazine
Umshau. DR.. Brennecke analyses the
climatic and geographical reasons for
the existence and continuance Of the
Gulf Stream. and points out how the
change in the wind currents and the
density Of the atmosphere all affect the
life and power of the famous current
This Is chiefly dependent, he points out.
on the location and areas of high and
low pressure over the sea. series of
carefully made reports over long
period OF time by the German Marine