Miscellaneous Intelligence. 141 
two udded together, make C,,H,,0,,-+-5NO,, Pelouze’s formula for 
pyroxyline.* With cane sugar, glucose, mannite, sugar of milk, dex- 
trine, and gum, analogous fulminating compounds have been formed by 
these chemists. ‘They have succeeded in crystallizing the nitric man- 
nite, and obtained for it the formula C,,0,H,-+-5NO,. 
6. Process for Photographs upon paper ; by M. Buanquart-Evrarp, 
(Comptes Rendus, Jan., 1847.) —This process is in part a modification 
of the Calotype, and is, according to its author, susceptible of many 
variations. The principles upon which it depends, are, Ist, the thorough 
impregnation of the paper by the photographic agent, so that the image 
is formed within the paper; an , the perfection of surface given to a 
moist paper by placing it upon a glass, which, in the camera, is turned 
toward the lens, the image being formed on the wet surface of paper 
in contact with the glass 
s this process seems to be more simple than any other, and within 
the reach of persons of moderate skill, we give it somewhat in detail. 
For the first or negative proof, the very best letter paper is to be taken; 
cautions of not including air bubbles, &c. ter one minute the paper 
is removed, held up to drain by a corner, and then laid upon some im- 
permeable surface and allowed to dry slowly. ; 
Another solution is prepared of 25 parts iodid of potassium, 1 part 
bromid of potassium, and 560 parts distilled water. In this solution 
the paper is entirely immersed, with the silver side up, and suffered to 
remain from one and a half to two minutes, according to the tempera- 
ture; it is then carefully withdrawn, holding it by two corners, and 
placed in a large vessel full of pure water; it is next hung up to dry 
upon a string, being fastened by one corner. 
Paper thus prepared should be protected from the light and preserved 
in a pasteboard case, but not packed too closely. It will keep for months. 
The solutions kept in vessels covered by opaque paper may be used to 
exhaustion, : 
To take a proof, a smooth glass is made quite level upon a suitable 
support, and upon it are poured a few drops of a solution of 6 parts 
nitrate of silver, 11 parts crystallizable acetic acid, and 64 parts distilled 
water; (half of the water should be taken to dissolve the nitrate, and 
the remainder added about an hour after the acid has been mixed with 
. 
The paper is ar to be applied to this liquid on the glass, the nitrated 
side downwards, and smoothed by the hand until-there is a perfect con- 
* In Vol. iii, p. 295, there is an error arising from including with the formula of 
pyroxyline, the SHO, which is separated in the process of formation. 
