Physiological effects of the Monochrematic Flame. 93 
Vogel has erento the proportion of soda which illuminatit 
gas contains (Journ. de Pharm. et de Chem., October, 1866), an 
Mulder has shown (in Ab same Journal, May, ~— with a 
facility marine salt volatilizes when heated with ¢ 
Small as the quantity of sodium is which case gas 
contains, it is sufficient to affect certain colors, and to produce 
on a small scale all the effects of absorption or extinction which 
are readily seen in a flame saturated with it. primers cers of this 
may be seen in certain green colors mentioned aboy 
Physiological effects of the monochromatic flame. The foregoing 
results explain a well known phenomenon, which has hitherto 
ever been accounted for. In the flame of alcohol and salt, the 
hands and face appear of a livid green eas eo the lips change 
to a blue-violet. This livid tint is know all who have seen 
punch or a pudding burn, and is due to ie alogiel more or less 
saline which is employed in these mixtures en at fur- 
appear Spon the features illuminated by their fire 
case the effect is produced by the NaCl which the 
alcohol constants of itself or which it derives from the alimentary 
substances; in the latter case the soda is obtained from the dross. 
and ashes of the combustible matters. The question arises, why 
under these conditions, the natural flesh color is changed to a 
bluish or livid green. The re ly is evident. It has been shown 
above, that the colors which best resist the extinctive effects of 
the soda flame are those which come from blue 
That there is blue in human blood ma sanily be seen by the 
color in daylight of the large veins on the skin of the hand. 
All the other tints which enter into the en peg of flesh 
bear without irritation either daylight or the i illumina- 
tion used at night, a result possibly caused by the absence of 
_ chemical rays in the flame, or sengee : inj ures the optic n 
which is poorly adapted to such a m 
After sitting for a considerable dine in the soda li ht, there 
comes a time when it is difficult - ee between gh 
ent shades of the same color. I have many times seen a tuft of 
leaves appear of the identical ae of the hand which held it so. 
