5^ Mr, W. Brande's Lecture on some 
small, its direction could not be observed, but the sulphureous 
acid vapour was attracted by the positive ball. 
8. The flame of the sulphuret of carbon (sulphuretted liquor 
of Lampadius) was attracted by the negative surface: the acid 
fumes which it throws off took an opposite direction. 
g. When phosphorus in a state of vivid combustion was 
introduced into the electrical circuit, the flame, and the phos- 
phoric acid produced, were powerfully directed towards the 
positive surface. 
The acid vapour which arises from phosphorus, during its 
slow combustion in a warm atmosphere, is also attracted by 
the positively electrified ball. 
10. A small stream of muriatic acid gas was allowed to pass 
into the atmosphere between the electrified spheres ; it was 
immediately attracted to the positive pole. This effect is ren- 
dered more evident by the diffusion of a small quantity of 
ammonia through the atmosphere of the room in which the 
experiment is made. 
The attraction of the muriatic acid is strikingly exhibited 
by coating the conductors with litmus paper, placing them at 
a distance of about six inches asunder, and 'propelling a cur- 
rent of the gas through a small tube between them. If the 
electrical machine is not in too powerful action, the positive 
ball is instantly reddened, while the blue colour of the negative 
surface remains unaltered. 
11. Nitrous acid gas exhibited the same appearances as 
muriatic acid. 
12. Potassium in a state of combustion was placed between 
the electrified surfaces. Its flame, and the alkaline fumes it 
produces, were drawn to the negative conductor. 
