Chemistry and Physics. 393 
covered by Graham. As the gases traverse the iron even at a dull 
red heat the authors call attention to the poisonous effeet which 
the oxyd of carbon must produce and attribute to its presence the 
unpleasant sensations which are always experienced in rooms 
heated by cast iron stoves or by air heated by contact sae des 
iron plates.— Comptes Rendus, \xvi, 83. 
3 
ellar spectra.—Succut has communicated to t 5 hon 
emy of Sciences in Paris some further rvations on iettins spec- 
tra, of a new spectroscope with a cylindrical 
achromatic eye- The author’s conclusions are as foll 
Ist. Red stars have generally spectra of ero ae type (like « 
rion, « Hercules, # Pe Ant eto 0 , &e, 3 ; when the 
fifth or sixth magnitude have their spectra perfectly estlvabls 
into columns which are afterward themselves resolvable into finer 
lines; such are the following: 
Right ascensions. Declinations Magnitudes 
5° 24m -]s + 18° 29’ 
45 46m -58 + 2° 16’ 5°5 
4h 44m 378 + 14° 1’ 5 
225 59m 578 + 8° 39’ 5'5 
235 11m 68 + 48° 15’ 
There are many others which cannot be resolved into secondary 
lines on account of the faintness, ot - which the principal lines suf- 
fice to indicate the type. 3d. The stars which cannot be referred 
to the three established types are very rare. The author has ex- 
amined several hundred stars below the seventh magnitude, o 
which is very extraordina fo in Lalande’s Catalogue, («= 
48 54m 108, cf + 0° 59’). In the aa of this star 
is divided into two bands by a broad obscure line, the yellow is 
reduced to a very clear and bei ight line, shi comes a b dark 
band, then a broad green nigiellow ow band, then another dark space 
and then a blue zo 8 1 curve ert this 
t 
spectrum. We ma loge 
nee character to ae spectra hort y col colored: liquids.— 
G.)—Sirius seen with the new spectroscope exhibits with great 
dhettottag the beautiful dark band in the extreme red. Between 
this and the sodium line D there a : very delicate nebulous ray. 
The author hopes soon to furnish ct measurements of the rays, 
after finishing a general survey oft ‘ti heavens with a 
tecting the most neces stars.— Comptes Rendus, rig = 
immediate object have resulted in the discovery of several 
and ek compounds. Fluoniobate of poms is redi 
ty by sodium i in a crucible 
