92 Correspondence of J. Nickles. 
just been discussing, it will be found that numerous causes pro- 
duce this effect, one of which is sod’wm, which burns with a yel- 
ow (m monochromatic) flame, that may be “obtained either by bring- 
ing common salt supported on platinum wire into the flame of 
the Bunsen lamp, or by burning alcohol saturated with salt. 
All the colors are altered by this flame, with the “onions of 
blue-violet, which is complementary to the yellow. Red appe 
ete af a sometimes bluish when it contains blue (a 
sa 
ear k (ex. nBr? , Mn? combined with ether, 
Mn0®, Cr203, pola leaf seen by peat light, Cr?Cl5, 
sje VA de Annales de Chem. et de Phys., [4], viii, 298, for the _ 
eit of the various colors whieh bidve been a 
wai 
ae 
sah igen oe ee 
white paper e give the eg eye of the spectrum and pe 
eolors with which it was obtaine 
Colors seen by Colors seen by a 
dayiight. ‘ Coloring material. hematin cisadie flame. 
Red. Ochre petits . . . Black. 
Orange. Iodid of mereury (Hel), Whit 
Yellow. Ciiecunatsa ie toad (PbOCr03). f oF 
Green. Manganate of baryta, Black 
Blue. Aniline blue, t sacs sce 
In this s Ee so wonderfully a. by the flame of alcohol 
saturated with salt, sunlight and the flame from magnesium in- 
not very Beiliiant they are modified as if they were illuminated 
by the soda flame. 
Thus etherial solution of perchlorid of rage when im- — 
= appears by gas light black instead of green mixed green — 
mposed of chromate of lead (PbOCrO8) and cibraraeiill be- 
aval in the same man 
of wicks of lamps and candles, ashes of fuel and atmospheri¢- 
air, which last, according to Bunsen, always contains traces of it 
