The Black Hills union. [volume] (Rapid City, Pennington County, Dakota [S.D.]) 1889-1904, 1890-03-14
Color of the Sea.

The changes in the color of the sea
have attracted the attention of seafaring
men from the earliest times. saws a wri-
ter in Science for 4dH. They struck with
wonder the PhGnicians when first they
the Atlantic; they excited the astonish-
nlent Of Columbus and terrified his COM
panions while in search of the far-famed
India, and they are no less Il surprise to
the modern navigator, to whom the
march of discovery has left few unex.
plored regions in store Numerous
theories were offered in explanation of
these changes. some ascribing them to
the varying color of the sea bottom,
some to differences in depth, others to
the presence of certain coloring SUBJ
stances, others again to the chemical
composition of the water Most of these
suggestions contained an element of
truth, although no one OF them, taken
by itself, sutficed to account for altera-
ton in color which has often been OBJ
served to occur in the course of few
hours sail, and within distance meas
uring less than ships length. OF late
years, as the reader is aware, numerous
scientific expeditions have been fitted
out and dispatched by the governments
of England, Norway and America for
the express purpose of exploring the
secrets of the deep. Among the prob
lens which have now for the first time
received satisfactory solution, new
light has also been thrown upon tho
conditions, which affect the color of the
sea water in every part of the ocean,
thus completing the information for
which We were indebted to the unalded
exertions OF earlier travellers One of
the most widely distributed contrasts of
color is that which is known to exist be-
tween the intensely blue seas situated
between the tropics and the green seas
of higher ATTITUDES 1t appears, as the
result Of recent observations and more
made on board the German frigate Ga.
Zello, that there is IN intimate relation
between the colors OF se;,-water and the
proportion OF salt held in solution by
the latter On comparing the specific
gravity of green water with that of blue
water, it was found that the latter is al
ways heavier than the former, and,
therefore, contains more salt. the two
differently colorcd waters being sup
posed to have the same temperature.
In other words, the greater OF lesser in
tcnsity of the blue color of sea water
may be taken as direct index of its
saltness and Of its specific gravity, so
that when we observe the color of the
water successfully change from Il deep
blue to blush green and 4 dark green
,l, l,- 1,,,
come ut the same time less salt and less
heavy. This result agrees with the ex-
perience of navigators in every part of
the ocean, for as the vessel proceeds from
the dense and salt waters of the tropi-
cal regions toward the lighter and fresh
er waters of higher ATTITUDES and of the
polar regions the color of the sea is seen
to change from an intense blue to a
greenish blue and green tint There
are, however, numerous exceptions.
Green seas are met with between the
tropics and blue seas are encountered
in the temperate region, and even with
in the Arctic circle, but these excep-
tons, far from contradicting. only tend
to confirm the above rule.
PIERRE, S. D., Feb. 21, 1S9O.-Notic'
is hereby given that on the sixteenth
day OF April, 1890, all the school land
in Pennington county will be leased a
public auction to the highest bidder a
the front door Of the court house in sait
county. The leasing will be conducted
by the county superintendent OF schools
| Said leasing will be held between tn
hours of 10 O'Clock a. m. and o'cloc
p. m. till all tracts OF school lands hav
been offered for lease. Each bidde
whose bid is accepted, must at once d,
post the amount OF his bid with tn
county treasurer. taking his receip
therefor. Ii the lease is not approve
by the governor, the money will be T.
turned. The following is the list c
school lands in Pennington county to
, offered: