60 Scientific Intelligence. 
bromide gives a violet vapor, the most remarkable absorption 
bands of which are in the red and the yellow. Proto-bromide of 
ors. Ali 
acetals heated gives a which exhibit systems of sens ye 
equidistant rays im about the middle of the spectrum.— 
— ome lxxiv, 
On the absorption spectra of the vapors of sulphur, seloniou 
ree and hypochlorous acid.—The same writer has obse t 
plates of glass gave at first vapors which absorbed the most re- 
frangible rays of the spectrum, leaving finally a red band extend- 
ing a little beyon On raising the temperature higher this 
band spreads out; the ‘other rays of the spectrum then reappear, 
the violet and blue being crossed by bundles of dark rays. The 
phenomenon is therefore the same as that observed in the case of 
selenium. Selenious acid at the instant of vaporization gives well- 
marked dark ae Sig nomen in the violet and blue. The author 
found the absorption spectrum of hypochlorous acid identical with 
that of Ny poshiieis and grit acids, only in the case of h 
chlorous acid the layer of gas must be much longer in order that 
the phenomenon may be distinotly ‘visible. Aqueous solutions of 
all these gases give the most salient lines of the gases pemeety es. 
— Comptes Rendus, Tome xxiv 03. w. 
4. Jluoride o of silver.—In continuing his researches on ae 
compdunds of fluorine, Mr. G. E has arrived at the following 
ults: Iodine acting upon ai fluoride with the aid of heat 
produces argentic iodide and fluoride of iodine. Fluoride of iodine 
red-hot platinum, but which corrodes glass at 60° F., and crystals 
of silicon at a red heat, as well as platinum in contact with argen- 
tic fluoride in a state of fusion. It fumes strongly in the air, and 
is decomposed by nag into fluohydric and iodic acids, 
F,+3H, a 
not act on an aqueous soieion of the salt at 
60° F. Rs Be of silicon placed upon argentic fluoride when 
fused became at once red hot, wenal ire sh ier combustion, and 
areola wean! of silicon. Al ump of tused —— st slowly 
in 
