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POPULAR SCIENCE REVIEW. 
with forms of clouds emmently electrical ” This conclusion is strengthened 
by some experiments, arising out of a similar event, conducted in America 
by Messrs. Gunther & Dove, who used the Geisler tubes in a dark room, and 
succeeded well in photographing the stratified discharge. A more careful 
and exhaustive series of experiments, conducted afterwards by Professor Kood, 
thoroughly established the facts advanced by each of the above-named 
gentlemen. 
Important New Work. — A new and practical treatise on photographic 
optics is announced from the pen of Dr. Monckhoven. Intimately conversant 
with this subject in all its practical as well as scientific departments, this 
work is likely to supply a want which photographers have felt for many years. 
Photography on Canvas or Panels for Painting. — The Art Student gives the 
following simple process for transferring photographs to these siufaces for the 
painter. A sheet of albumenized paper about two inches larger than the 
photograph to be transferred, is fastened by the four comers to a drawing- 
board, and covered with a solution of gum to -svithin about half-an-inch of the 
edges. When this is dry, a thick coat of chloridized albumen is passed over 
it, and the surface shielded from dust. On paper thus prepared, the proof is 
printed. When this is done, the dried print is coated with gelatine, and the 
surface is afterwards gummed upon a sheet of white paper, stretched on the 
drawing-board as before, but with the edges fastened dowm. When this is 
again dry, the first applied paper may be soaked with warm water, until it is 
easily removed. After drying once more the proof is gummed, and placed 
upon the canvas or panel, and when it is again dry, the sponging with warm 
water is repeated and the operation complete. 
PHYSICS. 
The Spectrum of Jupiter. — M. Secchi, so weU known for his spectroscopic 
researches, has given the French Academy a paper detailing the results of 
his investigation of the light of Jupiter. He found in the spectmm special 
atmospheric lines, which do not correspond with our own. The line C is 
entirely wanting in Jupiter, and the position of other lines is different. The 
solar lines exist in the spectrum of the planet ; but the atmosphere has a far 
greater absorbing power than ours. 
The Passage of Gas through Homogeneous Solid Bodies. — This subject, the 
consideration of which was commenced some time back by M. Deville, has 
been lately brought by him before the scientific world. His experiments were 
made upon the passage of hydrogen through the walls of wrought-iron tubes. 
A wrought-iron tube tilled with nitrogen is placed in a porcelain tube, through 
which a current of hydrogen is passed. Upon observing the pressure upon 
the inside and outside of the iron tube, it is found that that of the interior 
may become almost double that of the exterior, in consequence of the hydro- 
gen permeating the walls of iron and adding its pressure to that of the 
nitrogen. Unless the temperature is very high, no nitrogen passes out ; but 
at very exalted temperatures it is found that the two pressures become nearly 
equal, in consequence of the intermolecular spaces becoming so dilated as to 
allow the nitrogen to pass through them. Hence it follows, that if we were 
