The citizen. (Frederick City, Md.) 1895-1923, 1895-07-19
Written for the Citizen

Thus far experiments in color pho
Biography have been of two classes
those of Lippman, in which an attempt
is made to produce ordinary pictures
in coIors, and the more promising
ones in which the photographs are un-
colored until the images have passed
through the proper glasses. The latest
process in the latter class is that Of DR..
Jolly, whose pictures, as thrown on a
screen by the oXyhydrogen lamp, at
tracted much attention at soiree of
the Royal Society. In this process is
used special Photographic plate, over
which i placed a glass screen, closely
ruled with lines Of orange green, yell
low and blue-vioet. The sensitive sur
face l. exposed ia contact with this
taking SCREEN The developed neg
alive Is uncolored, but has a ribbed or
lined appearance, due to the fact that
the colOred lines have exercised "a Sc
lective influence III a manner similar
70 that OF the nerve-euds of the eye,
and thus the negative has perma-
uent record of the colors of the object
photographed From the negative is
then printed a transparency on
glass. y "reviewing STRENGTHENING
lines OF deep red, bright green and
blue-violet Of exactly the same width
as those of the other screen-is placed
over this positive, when the coIored
picture flashes into view. The same
pair Of screens may be used for many
pictures, if desired, but a permanent
color photograph can be kept only by
attaching the viewing screen"
The usual method of removing a
glass stopper that has become fixed Is
TO heat the neck of the bottle over a
candle or gas-fiame. The inconven-
fence and risk of this old-fashioned
plan have led Mr.. Is. w. Hill, OF Man
chester, England, to devise for the pur-
pose little electric heater, consisting
OF coils Of platinum wires embedded in
asbestos aud held to the neck of the
bottle 10y an adjustable clamp.
Bone Slate pencils are an English
hovelty They wear 100 times as long
aS he ordinary pencils, DO not break or
scratch, and make clear, fine mark
easily erased.
The aboriginal remains unearthed a
lev weeks ago in Il cave OF the Port
Royal Mountains, in Jamaica, promise
lis an interesting glimpse Of Il vanished
race. An account 10y MIR. j. Il. Duer-
den, of the Jamaica Museum, states
that The AraWaks, y no were a peace
able people, probably numbering about
500, 900, at the time of the discovery of
Jamaica by Columbus, in 1891, We're 20
/ cruelty treated by their Spanish con-
/ querels THAI the orIgual type seems
To have been entirely destroyed before
/ The English conquest OF The island in
1000 Little Wus left to show that
these Indians ever existed. The only
two aboriginal skulls hitherto known
were found in cave al Padre Bluff.
and practically the only relics of the
4 native arts and manufactures have
been some fragments Of primitive pot.
terry and few flint implements aud
beads The new find includes the
skeletons of not less than "A jndIvidu-
ais of all ages from early infancy up
ward. With these were canoe of &c.
/ dar-wood, a weil-preserved mortar OF
/ arbOr-vitae, two small eartheuWale ves-
/ sells, a flint implement, bones of the
! cOney and some land and maliue
/ shells. The cave is too small for "a l.,.t-
ltation for So many persons, and it is
/ supposed to have been used as a burial
/ place and perhaps also as a refuge from
the Spanards.
With the present system of mount
I ing, a serious obstacle to the increase of
/ the size Of telescopes is the difficulty OF
/ constructing and manipulating the
I great tubes. 1t is hoped to avoid this
obstacle III the telescope for the Paris
Exhibition of 1900 by supporting
/ the tube in fixed position
and applying the moving mechanism
+ to a mirror in front. The tube of this
instrument is to be 2S0 feet long aud 4
feet in diameter. The mirror, it is
4 stated, will be of solid glass with a sill
\ vered surface, and will have a diane.
ter of feet, a thickness of . feet, and
"a weight, exclusive of mountings, of II
I tons. Great thickness is given the
mirror to avoid tlexure and consequent
reformation of the images reflected in.
to the telescope.
An anomaly of the japanese Archi.
/ pelago mentioned 10y Prof. b. II.
/ Cham berlain is the decreasing size OF
the vegetation toward the south. In
lezo the summer grasses ard tall
weeds reach above the head of horse
back rider; in central Japan the grass
/ Is seldom taller than man on foot,
and in Great Luchu everything is still
smaller, and there are no tall grasses.
y gold medal was recently awarded
/ Herr Won Prosch tor his success in in.
PRODUCING tropical birds into German
/ forests. Disliking to keep his pets
1 in cages. his canaries We're first
/ liberated in a large room, then
allowed to pass in and out through
, small windows, always getting
, their food inside. The birds soon
began to build nests outside and
to rear their young there. Two
pairs of South American parrots We're
. next set free, and last summer raised a
+ brood of young, which, with the old
: birds, passed safely through the excep-
| tionally severe winter. In their wild
life the yellow of some of the canaries
i has disappeared, the entire tribe now
having the green color of canaries in
their native islands. This new bird
colony is located in southeastern Sax
ouy, where the average winter temper
allure is about that Of New York and