New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1875-05-25

SUBSTITUTE FOR INK.-A substitute 1Or INK Has
been devised by DR.. Jacobsen of Berlin which con-
sists of points, like the leads of ordinary pencils
thacan be fitted into holders. The writing at ilrst
very much resembles lead pencil marks, but when
moistcued Immediately assumes q violet TINT, ana
tLcn adbercs 10 the paper like ink AS many az SIX
GOOD copies can he taken from 1t by means OF an
ordinary copying press.
THE REDUCTION OF ELLIPTIC IYTEGRMs.-From
a mathematical paper by Mcissel, Professor at kiel,
We take the following thcorem, whose enunciation
will be of interest to mathematicians. He states
that in great number of cases, he has been able to
rcprcscnt the complete elliptic integral, of the sec
ond ORDER by means of agebraic formula, and dem.
onstrates, in general that the complete integral OF
the second order can be converted INTO complete
integral Of the first order.
PRESERVATION OF MEAT, VEGETABLES &C, BY
ACETATE OF Notwithstanding to an English
patent fresh meat, fish, vegetables &c, are pre-
served by mmersng them in a more or less concen-
trated solution of acetate of ammonia, and allowing
them to dry in the air. If the articles are to be pre-
served for months, years they are packed III cans
or casks filled with solution of the SALT The bon,
ing, roasting, &c. readily expcls the acetate, ana
the articles are said to be free from the swedish
taste which acetate OF soda inlparts
ABSORPTION OF OXYGEN BY PLANTS IN THE
DARK-According to Dchcrain, leaves kept in con-
fined atmosphere i'll darkness will absorb the whole
of the oxygen and still continue to give of carbonic
acid the resistance to asphyxa varying with the
species. The rapidity of growth and energy OF
respiration of plants are both favored by obscure
heat: and il is shown that the internal coinbSti0n
by the absorption of oxygen ana emission OF car
bonic acid is the origin of part of the heat ncccs-
sary to the elaboration of new proximae principles
i'll the plant.
PASTE FOR PHOTOGRAPHs.-Paste prepared as fol-
lows, is highly recommended by funny for photo
graphs: Mix thoroughly $50 grains of the finest
Bermuda arrOwroot with $40 grains of cold water
in a capsule, with spoon or brush, then add 1913
water, and 60 grains of gclatinc III fire
shreds. Boil with string. for five minutes, or until
375 grains of alcohol and D to drops OF pure ear
bolic acid Keep in well-closcd vessels. and before
use work mp portion carefully with brush III
dish. 1t is said to keep for Il considerable time.
HEAT AND PRODUCTs OF GUNPOwDER EXpIO-
sIoNs.-Accorlng to recent experiments by Capt
Noble and Mr. Abel the temperature Of the explosion
of gunpowder by means of platinum wire or tin
foil. is about 1900 C.. The products of explosion
consist of about ffty-sevcn parts, by weight OF
solids, to ry-three Of permanent gas when the
powder fills the space in which it is fired, the pressure
is about Il, 100 amosphcrcs. or ~ tons per square
inch. The products of explosion generally are the
same il gun and in "a completely closed vessel
while the work on the projcctc is due to the elastic
pressure of the permanent gases.
COLOR OF CHINESE BRoZEs.-A chemical ex-
animation Of some Chinese and japanese bronzes of
an unusually deep color exhibited in Paris in 1869
has shown the existence Of much larger percentage
of lead than occurs in the ordinary bronzes, proving
that il is to this substance that the special compost
ton and color Of the bronze is due. Where zinc was
present in considerable quantity il seemed rather to
counterbalancc the effect of the lead An alloy
composed of parts tin, - OF copper, 10 OF lead
and of zinc, proved to be exactly IKE the GhlneSe
If heated in muife il quickly assumed a peculiar
dead black appearance so greatly admired III Chinese
brOnZcs.
MEASUREMENTS OF Terrestrial MAGNETISM
Attention is called by Braun to the practicabity of
applying the nclinatorium TO the determination OF
the intensity of terrestrial magnetism. This was
first suggested and applied by Lamont and Lloyd
but seems to have been generally neglected. Braun,
however shows that both theory and practice agree
in proving that this method allows OF the same de-
gree of accuracy as that attainabc by the best mag
netoneters. In detail he finds that Lloyd's method
gives the total intensity accurately than the
horizontal intensity, but by the maSnetomcter
method the reverse is the The accuracy OF the
results obtained by Braun is attributed, in part, to
are now made in England, and he recommends
earnestly the nclinatOrium as a portable magnetic
instrument, upon the score of accuracy convenience
and cheapness since with 1t one may make a com
plcte series of magnetic observations, without also
carrying declinoneter, magne tometcr, rejecting cir
cle IheOdolie, or clock. A simple addition to the
instrument even allows him to make absolute, as
well ~ relative, determinations.
EFFECT on SOUND AND LIGHT OF THE MOVEMENT
OF THE OBsERvER.-The long vexcd question as to
the effect upon observations Of the movement of the
observer and the source of light sound las been
calculated by Baron Eotvos of Pcth. who, in a re-
cent communication, extends hi- former invcstiga-
TONS and offers satisfactory reiutatlon of several
objections that have been raised According to him.
in case the source of sound or light be moving, the
intensity must be defined IA tho living force that
would fall in unit of time, upon unit OF surface,
parallel to the wave surface if all vibrations
like those which are impaired TO the surface at that
instant in which the intensity is to be determined.
The formula for the intensity in question, as de-
duced by EotvOs, shows that the movement Of the
observer has decided effect upon the result, and by
APPLYING this to the of observer moving upon
locomotive with velocity of an hundred feet per
second aud listening to sound whose origin moves
at the same, rate he finds the observed sound *
times IN loud when both are ut rest method -
also explained by him, showing the possibility OF
testing his conclusions By experiments the heat
received and sent By moving bodies
THE CorroS WoRM.-Dr. A. r. Grote advances a
some " hat novel and at the same time encouraging
theory in regard TO the cotton worm, injurious to
the agricultural interests Of the Southern States.
The result of careful inquiry into its history has led
him TO the inference that it is in reality native of
South and Central America, that its appearance in
the United States is the result of immigration from
the South and that il dies out every year with its
food plant, the eggs which it lays not coming to