138 ME. GASSIOT ON THE STRAimCATIONS IN ElECIEICAE DISCHAHGES, 
those that remain are as they were originally hermetically sealed. To ^ 
luld in several instances he nearly a repetition, altho^h I use some of the ongm 
“r^ht “ H;CX;e:t -ena, denote, n.e. 
etherise described, that previous to ‘t; “^ef 
either with air, hydrogen, oxygen, or mtrogen. The wete t 
good air-pump; another supply of air e introduction of 
exhausted; this was generaUy repeated two or three beioie 
the mercury; any residue remaining after the tubes had been &aUy exhanste 
Torricellian vacuum would necessarily be mercurial vapour plus the remams of an 
the ffas with which the tube had been originally filled. 
tL greater intensity of the discharge from the outer teirnmal of an mduction cod. 
rentes it advisable if not indispensable in many experiments that this P<>“ ^o 
be noted; I had intended to apply the terms inductnc and inducteous (first usrf 
bv Fakaday in 1838), the former to the outer and the latter to e inner, 
wL this might leO to some misconception, in the present communication I use 
the teLs outer or inner fodtive, outer or inner negative, to denote the condition of the 
and reciprocating feto^cs.-These terms 
of the discharge from an induction coil, when taken in vacua-tubes P“ , 
dls^Lge the needle of a galvanometer placed in the cfrcuit will he deflected ; and th 
stratifications in the vacuum-tube wUl be also deflected by, and have a tendency to rota 
a whole round, the pole of u magnet. ^ , . 
In a reciprocating dischai'ge, the needle of the galvanometer placed m ^c^ 
not deflected- such discharge in the vacuum-tube, whether stratified or other-wise ^1 
bfdivided by’a magnet, similar to the discharge when taken fr-om a single te^Kb*)’ 
wl"always reciprocating, as is also the discharge under certain conditions to be 
described, where both wires of a vacuum-tube are attached to the termmals of the induc- 
"T^thr following experiments, unless when other-wise expressed, one ivii-e m the 
vac— be was bonneted with the outer and the other with the inner teimmal ot 
the coil. 
Clmracter of tU Stratified Discharge under different conditions of rarefied Medta, 
63 If the tube is filled with dry hydrogen, and the discharge from the induction t 
be made in the usual manner, no trace of the discharge (the wui-es being “ 
the tube beyond the striking distance in air) ivill be observed until the gas is laiefi 
1 1 — pump. The discharge fii.t appears as a wavy line of bluish-grey colour ; on 
1— gTheUaustion by die air-pump, assisting the raiefaction by gently heating. 
