New-York tribune., 1868-03-19
SCIENCE.

TIE DRAGON TREE-The giant specimen OF
the Dreeona Draeo growing az S paIe Of wind
This tree was first brought into general n1,e =, O ono
boldt about 60 years ago. when ne ~ W OVVO
years old n
ANrIpoTE FOR EXTERNAL POISONING
CYANIDE of potassium extensively used IN
and other Prooesse % who nse it, eorrespondent
ef rae Journal Of Chemistry says experience mas
saught him most eectual remedy in such cases
~ RE proto sulphate OF fine powder thoroughly
mixed with raw lnseed OIL
THE VOLTAIC ARC.-In regard to the estaD-
Hshment OF the vOtac arc NJ La Roux states that results
similar 70 those gwen by induction currents may pe oo
tanned with the ordinary currents from VoGalo o,
with nitric acid battery elements the current may
be interrupted for about onetwenty fifth Of second ana
they may be Onetwelfth Of an inch apart
BLACK PAINT FOR PHoTOGRAPIlIC USE Uses ;or
MI NJ. Carter has published the following WI |e VI
making cheap and durable black pant ioF Ist f damien
Ianpblack with alcohol then INK t win sweet nh & 70
proper consistency when 6d & II I po crack or rub Off The
pme process will apply when other cooilnS substances
substituted for lampbiacA
LITE FOR THE ABORATORY.-Chemists eX-
pernentDg with chlorine gas will find soreIs oxychlorde
Of zinc excellent lutte II IS made 6y mixing o9nneI
I've of chloride of zine Of 26 specific gravity and rub
bing the whole thoroughly together IN mortar Inc
axture must he applied soon made, Tor hardenS
very miekly ANY apparatus luted with this material
will serve for at least three months
NEW YELLOW DYE.-Martus has obtained
from the Naphthane Of gas works dinitrOnaphtyl by
treating solution Of muriate Of Naphtylamin and nitrate
Of potash with nitric acid. The compound is weak
acid which is purified by crystazatiOn II is scarcely
soluble in water but more so in alcohol IT'S salts are
either orange minumred in color The yellow PtlhSS
ple serves for yeng wool and printing carpets tyelus
Brilliant goldenyeow tnts not greenish ones Ike those
from picrc acld.
ARTIFICIAL GEMs.-The base OF these gems,
rs patented by the superintendent OF the Royal
Works AT Berlin is lux obtained by melting together
drachms OF dry carbonate Of soda. 2drachI pht DOA
draehm satpeter drachms miniun, ana lt OuUcSs VI
pnrest white sand To initiate in color but OF course not
IN composition the following minerals add To the huX the
Ingredients named in connection VIII eheh gem
Sdpphife.-2 grains carbonate OF cobalt
Opdi-l0 grams oXyd Of cobalt Is grains oxyd OF man
yanese, and from % 10 30 grains protoXyd OF iron.
HethyS-4 to- grains carbonate OF perO1yd OF man'
i,anese.
Smar0gi2O grains protoNyd OF iron, 10 grains earoo-
nate of Oxyd Of copper.
Beryi.-l0 grains protoxyd Of iron.
FLUIDS IN CRYsTALs.-At a late meeting OF
the Manchester Literary and Phl0sOphleal SOcisly Ml
j. Dancer gave history of the discovery of fluids in
CRYSTALS including Sir Humphrey Davys chemical expert
spents with fluids and gases obtained from the cavities IN
snarZ CRYSTALS Sir David Brewsters discovery OF the
pressure i'm the diamond, ruby, emerald, alhetnysl,
fhrysOberyl &C. Of the existence OF minute crystals IN
such cavities, and Of the two remarkable nuds cOOtess
hydrocarbons found in amethyst from Siberia ana quartz
from Quebec, named brewsterlne and cryptone Ooth
are sometimes found in the same crystal but are not
mscibe Brcwserme is said to be 81 times more expah-
sble than water Mr. Dancer described numerous crys-
tails from various parts OF the globe examined Oy MN
which contained fluids the most noticeable being IN uOr
s2ar of Derbysre which burst at lSOo r. temperature
He suggested the employment Of the microscope IN ds
nnguishing spurious from real transparent gems Al the
conclusion Of his remarks crystals containing fluids were
exhibited under the microscope, and, While undef eA-
animation the temperature OF each was elevated 10 show
the expansion Of the fluid within II.