432 Royal Society. 



another, as well as the steps of transition between each are minutely 

 investigated ; and the conclusion is deduced that the glow is in its 

 nature exactly the same as the luminous part of a brush or ramifi- 

 cation, namely, a charge of air ; the only difference being that the 

 glow has a continuous appearance from the constant renewal of the 

 same action in the same place, whereas the ramification is occa- 

 sioned by a momentary and independent action of the same kind. 

 The disruptive discharge may take place at degrees of tension so 

 low as not to give rise to any luminous appearance ; so that a dark 

 space may intervene in the line of actual discharge, as is frequently 

 observable between the brush on one side, and the glow on the 

 other. Thus it is inferred that electric light is merely a consequence 

 of the quantity of electricity which, after a discharge has com- 

 menced, flows and converges towards the spot where it finds the 

 readiest passage : and these conclusions are further confirmed by the 

 phenomena which take place in other gases, besides atmospheric 

 air, and which are specifically detailed by the author. 



The last kind of discharge which is here considered is the con- 

 vective or carrying discharge, namely, that effected by the transla- 

 tion of charged particles from one place to another. The phenomena 

 attending this mode of transference are examined under various 

 aspects as they occur in air, in liquids of various kinds, in flame, 

 and as they are exhibited in the case of particles of dust, which 

 perform the office of carriers of the electricity; and also in that of 

 solids terminated by liquids. Thus all these apparently isolated 

 phenomena comprised under the heads of the electric currents 

 which characterize electrolyzation, of transference through dielectrics 

 by disruptive discharges of various kinds, or by the actual motion of 

 charged particles, and of conduction through conductors of various 

 degrees of power, are assimilated to one another by their being 

 shown to be essentially the result of actions of contiguous particles 

 of matter assuming particular states of polarization. 



The author lastly considers electric currents, not only in their 

 effects on the bodies they traverse, but also in their collateral in- 

 fluences as producing inductive and magnetic phenomena. The 

 analogies, which connect electrolytic discharge with that by con- 

 duction, are pointed out, as tending to show that they are essentially 

 the same in kind, and that when producing different kinds of mo- 

 tion in the particles of matter, their mode of operation may be re- 

 garded as identical. An attempt is made to connect with these 

 views the lateral or transverse actions of currents, which are most 

 distinctly manifested in their magnetic effects ; these effects being 

 produced equally by the disruptive, the conductive, and the electro- 

 lytic discharges, and probably depending on the transverse condition 

 of the lines of ordinary induction. This transverse power has the 

 character of polarity impressed upon it, and, in its simplest form, 

 appears as attractive or repulsive, according as the currents them- 

 selves are in the same, or in opposite directions. In the current and 

 in the magnet it assumes the condition of tangential force ; and in 

 magnets and their particles it produces poles. 



The author announces that he intends shortly to develop, in an- 



