414 Scientific Intelligence. 
composition is C, HCl,, and therefore completes the series of chlorine 
substitutions in C, 
The reaction of alcoholic solution of potash is er —_ and 
gives rise to chlorid of potassium and protochlorid of carbo 4 Clg. 
e properties of the new substances are as follows. bk remains 
liquid at 32° Fah., and boils at 309% Fah. Sp. gr. at 32° i 
agreeable like that of honey. Taste sweet and burning, but less so than 
that of the Dutch liquid. 
[It is to be remarked that the boiling point of this liquid is as much 
above that of the next chlorine compound, as that is above the boiling 
ere of the one before, the difference being 20° cent. G. C. 8. 
On Cochineal ; by Warren De ta Roz, (Phil. Mag., Dec., 1847, 
oa ricer )—It has been stated by Beissen that hydrosulphurie acid 
would decolorize the coloring matter of cochineal. ‘This, M. De la Rue 
has found to be a mistake. A very complete examination has satis- 
fied him that carmine is in reality an acid, for which he proposes the 
name of carminic aci 
It was at first iuieh difficult to prepare this substance in partion 
by ve eae rom acid. Repeat this, adding acetic acid to the acetate, 
evaporate to dryness, ns eg —— alcohol, digest with some 
carminate of lead, precipitate nitrogenous matter by ether, the 
filtrate yields pure carminic vest 
This substance is purple brown in mass, T ich red in powder, very 
soluble in water and alcohol, slightly so in ether. Strong su sulphuric 
and hydrochloric acids dissolve it without decomposition 
Th Hig Ove, its acid character 
is but feeble and no salts were prepared, save one, with ¢ copper. 
The action of nitric acid is violent and a new acid is formed, called by 
the author the nitrococcusic. ‘ Its properties are similar to the other acids 
ined by nitric acid. The composition is C, , H, Nz Oy.» the salts, of 
aeeh several were formed, are C,,H,(M.)N, G. C. 5. 
16. On the Conductility. of Seat by. Crystallized “Bodies ; ; by M. DE 
SENARMONT, (2nd Memoir in Comptes Rendus, Nov. 15, 1847, p- 708.) 
—lIn this. memoir the author establishes the following propositions; 
which correspond in their general character with analogous prin neiples 
relating to the propagation of light by crystals. 
l. crystals of the regular system —— or tesseral) the 
conduetility is alike in all directions, and the isothermal s urfaces are 
spherical surfaces concentric to the source of ait 
2. In deveinle of the square prismatic system (dimetric) and in a 
of the rhombohedral system, the conductility i is alike in all directions 
at right angles with the vertical axis; and isothermal surfaces are Com” 
centric ellipses of revolution, oblong or prolate, —. to the source 
of heat and revolving about the axis of symmet 
3. In crystals of the right rectangular prism pie trimetric seer’ 
ie wos differs in three directions, or has three principal Vv 
rec tangular ¢ directions s parallel to the edges of the prism, 
od 
ellipsoids, not of revolution; 2 
wees axis s correspond. to the edges. 
