New-York tribune., 1876-07-22

principles OF which is perfectly equal tn inhi-
gotine This is obtained by exposing the colorlng
principle of tho m0llusk to the air until it assumes
violet tint; then washing it with crystalline acetic
acid which disSove5 the tint Water Is then added
to the acetic solution, and ths whole shaken mp with
chlorofoun which dis-olyes the purple. The chi"r'-
forIs solution leaves behind, after ev1po'aiion' tl'
residue, which is violet Washed in ether, this l.
deprived of the rel principle contained in 1t, and
the remainder is redissolved in alcohol. IL Is vel
known that the ancicntS preferred ilt secretion I
the Nrec bydRd0ri5 70 thar OF the V' VHH'fi"3' lt
is found that the secreti0aS oi ihose t"o a.rc.'
are by no means the same, AMI thdt theli pIold'tS
from solution are different. In Tact the secretion oI
w. brandOris is photogenic; that Is 10 say, II docs
NOT become coldred by the deprivation OF j ght,
while Thar of ~ trpcuiis becomes violet hv contact
with the air In reference 10 the studies OF the col
orug matter found in the 4. rIdis they remark that
they have found chloropyl in other moiiusAs lden-
teal with the coloriug matter of yegetln9
PURrfCATIoN OF FIXED VEGETABLE Ous.-FiXed
vegetable oils are purified much more perfectly and
cheaply than usual 10y "a process practicei in Tn
gland in which the agitation Of the oil, during purii-
cation is accomplished by a current Of air forced
into il through system of perforated tubes enter
ING the bottom OF the vessel instead of oy means o
revolving paddles The sulpluric acid is added to
Vie oil, Is usual cautiously during the ag'tatIoi'
and On account of its more thorough contact WIN
the oil. effected by this method, the carbonzatlon
pete. The acid IL removed FROM the pnrihei oil rs
usual and any residue of water by means OF steam
heat.
RAUDuY OF GEowru ~ CERTAIN FIsHEs.-Mr.
Mitchell, in a communication TO Nature, presents
some remarkable facts in regard to the rapi hty of
growth of fishes. Referring to a species Of carp,
called by the natives hd'tb he states that this is
species which does not breed in Fl 'sh water, but
that The natives are ia the habit Of introducing the,
fry into ponds etc. where they thrive very satisac-
torily. According to his account tank 50 feet
long, % feet broad, and 13 feet deep was dug
within the premises at Garden Reach IN May 1879,
and a number of tie HaiQb fry. from half an incl!
to an inch IA length were introduced abpat tIe ehd
q July. On the 22d OF September the tank vas
sW pit with nets t1 catch one or two hS OF the P"e
species that had been acciGcutly introduced With
the Others In the net taken several dozens OF
carp referred to- one of which weighed \ ounces
aud was II inches in length. Others were odIy q
tew ouuCcs hitT. The food supplied 10 thcS" h'l
consisted, IN addition to the natural vegetation OF
thepond of the refuse of rice and other substances
thrown into the pond by the natives.
FArTEyING OF OYsTERs.-Prof. Fraser, in aeon
muncation to the Academy of Natural Sciences, in
speaking on the general subject OF Dialy,is sug-
gested It's application the fattening of oysters, re-
marking that oysters brought to the large markets
are generally immersed for a short time III fresher
water than that from which they taken, re-
sultng in an increase OF size or pumpness. Tins,
however, only lasts for few days. 1t the end OF
this time the oysters become lean again. having lost
the plump appearance. Dr. Fraser remarks that
although sometimes corn meal OF other substances
alc placed upon the oysters during this operation 1t
can have no material effect in increasing the amount
of the hesh but that the increase in size is due en-
tirrly To the absorption of moisture Inc tisseS or
oysters when first taken are saturated with the
ocean brine, and when removed 10 fresh water, or
al - col
ward more rapidly than the more saline ana delser
clements within can escape; the effect being simply
to cause the oyster to swell with increase Of It's
virtues. When the water in which the oyster Is M
mcrsed is too fresh it loses its flavor. Prof Fraser
suggests that by mmersing the oysters for some
days IN concentrated brine aud then removing them
10 ocean water, the plumpaeSs would he gained
without the sacrifice Of the satueSs which Is so
agreeable to the epicure simple method Of ascer-
taiuing Whether the oysters increase III flesh or not
would ue to take 90 more from given locality
on th, sea coast AID drying them at 2-J) Fdhren-
hct aud asccraiulng tnoir average weight ana 'Deh
Ticatluq the process for the number Of Ike
oysters after trIusplantng,