New-York tribune., 1870-08-08
SCIENTIFIC NOTES.

To PRESERVE THE Form OF FOSSILs.-FOssils
often frsbe that they fall to pieces the slightest
handling. To make such remains coherent NJ Faraire
saturates them in solution of silicate of potash
MALTESE SHEEP.-This well-marked and pc
euar variety has been introduced into Algeria aud NJ
de Bray agrculturst OF that colony, in paper read
before the Agricultural Society of France expresses the
opinion that this curious has arisen from cross be
tween ram and a she-goat.
PoTARo FALLs.-Mr. Charles T. Brown of the
Geological Survey of Demerara has found magnificent
fall the Potaro River, hitherto unknown. The river
passes over table land composed OF slightly inclined
beds Of sandstone and congomerate 16 feet above @ o
0 & 3e 81 sea- S G & ct e river about 800 feet
wide, and it's greatest depth is from 10 to Is feet
FIXING DYEs.-Mr. Ripping of Manchester
England has a process OF fixing dyes. lie dissoN's
~ OF gelatine in water and ADDS tnree o'' Vi
bebromate of potash This done in dark room Ihe
ooorng matter then added aud the gooas s@uD.te @ s
thereto after which they are exposes 10 c ato d "a
the pigment thus becomes nsOluoc III water anu
the color is fast.
To REMOVE NITRATE OF SILVER STAINS
NJ Grimm states in German journal that chloride OF
conner completely removes nitrate of silver stains from
eolored cotton cloth 1t should aerward be washed with
hyposuphie OF soda ana theh Ioiough! washed Win VIII
water Such stains are more CitcCtuaUy removed from
solltoH OF permanganate Of potash and hydrcchoric
acid. which is TO be followed by washing with hypoSu
phte of soda aud plain water This process renders the
Of the highly poisonous cyanide OF potassium uI
necessary.
To PREVENT w ATER FROM BECOMING PUTRlD.
As water containing air does not become putrid
Mr. Ruuge wrOughron TO free water from the dis
solved oxygen derived from air Many persons have on
served the disaeeable OdOr eXhaled by water IN which
flowers are kept in badlyventilated rooms this cOnd
tOn NAV prevented altogether, leSsened III great
degree by placing few iron nails I'm the water TINS
OF iron affords cheap means of preserving drinking
water during sea voyages.
DUALIN-This name is given by Carl Dittmar
OF Charlottonbmg, Prussia, to new explosive com
pound Of which he is the inventor. In the open air
burns without exploding and IS not sensitive TO concus-
sion when confined tmay be exploded lt has from
four TO times the strength OF equal weight OF com
mon powder, and is not liable, like guncOton ana sew
era other explosives, to slow Scfdecomposton. Duan
is composed of ceulOse nitrOcelluoSe nltr0starch,
nitrO-mannite and ntrOg lycerine mixed in different
combinations, depending on the degree OF explosive
power required.
To PROTECT WOOD.-Dr. Reinsch recon-
mends the following plan: The wood wpaned, is to be
placed hours liquid composed Of part of CON
CentTated scae potash water glass; and three parts of
pure After being removed and dried for several
days the wood is again soaked in this LIQUID and after
being again dried, painted with mixture OF one
part OF cement and four parts OF the above liquid When
the first coat is dry the painting should he repeated
twice. The paint mixture should only be made up IN
small quantities II rapidly becomes hard ana dry.
Wood thus treated becomes inhammabe and does not
decay under ground.