Chemistry and Physics. 475 
The pile was placed about 30 cms. from the axis of the p prism, 
and the breadth of the admission slit was half a millimeter; its 
pealer magnitude as seen from the prism was 5/7, conseqently 
ach cold band made its effect sensible tural an angle equal 
to its own angular width et eae bag 5-7. The illumination slit 
also had a width of half a millime 
same as those of the lines given above 04 the absorption of a 
centimeter of water. This coincidence seems to prove that the 
cold bands in the dark portion of the solar spectrom are ina great 
measure due to the water of the pase: osphere 
Another series of experiments were made to compare the action 
exerted on dark spectra by different phonies formed by disolving 
a solid capable of forming cold lines, in liquids nearly inactive in 
this respect, The nee: substance emplo was iodine, whic 
having the positions given below: 
Chloride. Chloroform. Sulphide. 
1° 28/ 1° 30’ aren 
1 Sat ea 1° 35! 
1° 55! 1° 57! tks 1° 56! 
These eet show that the action of the iodine is the same in 
the three In all the experiments observations were made 
on that vane of the spectrum where the iodine solution produced a 
line, so that the solvent and the whole refracting system had no 
moptes 
action in the —— of the phenomenon.— Vom Rendus, 
Ixxxi, 432 ; ag., B. 0. P. 
10. cel of Flames.—M. F. Wineu has examined the 
causes of luminosity and non-luminosity of flames. Kna app 10 found 
at the flame of a Bunsen’s burner became now-luminous if nitro- 
ape hydrochloric acid, or — dioxide be passed into the air 
oles instead of air. Bl lockm 1 fonnd that eck emerR and 
hydrogen have the same action, lama the same effect is produ 
as Landon has lately show n, by ste am. When, however, any su 
mixture i are shel strongly heated pele et under wi by fs combiston, 
two horizontal ek hee An iron tube may es he used instead of 
the Platinum tube, but, on account of the higher specific heat of 
“hese it must be more strongly heated. A rag burner cannot 
used, because it colors the flame us flame 
it eone as a cone between the inner tae and the outer blu- 
This is not caused, as might be supposed, by the gases 
