48 Dr. J. A. Fleming on a Phenomenon of Moiocular 
possibly of other conditions besides. Other things being 
equal, it appears to be a general rule that the weaker the solu- 
tion, the greater the degree of nonadjuvancy. When a gas is 
one of the permanent products of electrolysis at either elec- 
trode, the greater the surface condensing-power of the material 
of which the electrode is composed, the less is the degree of non- 
adjuvancy. 
VI. On a Phenomenon of Molecular Radiation in Incandescence 
Lamps. By J. A. Fleming, B.A., B.Sc* 
1VT0T long ago a curious phenomenon came under my 
-L i notice in connexion with the burning of Edison incan- 
descence lamps, which presents sufficient interest to warrant 
my drawing the attention of physicists to it. 
As is well known, the carbon filament in the Edison lamp 
is of a horse-shoe form. The two extremities of the loop are 
LINE OF 
'NO DEPOSIT 
clamped into small copper clamps on the ends of the platinum 
wires, which are sealed through the glass. The ends of the 
carbon loop are electroplated over with copper at the place 
where they are connected to the clamp in order to make a 
* Communicated by the Physical Society, ha-viu^ been read at the 
Meeting on May 26, 1883. 
