l-lac app. were as follows:

App. i. Lac. App. ii. Air.
Balls 255 deg..

0 deg. . . . .
. . . . 304 deg.
. . . . 297
Charge divided.
113 . . . .
. . . . 121
0 . . . . after being discharged.
. . . . 7 after being discharged.

1258. Here 297 deg., minus 7 deg., or 290 deg., may be taken as the divisible charge of
app. ii. (the 7 deg. being fixed stem action (1203. 1232.)), of which 145 deg. is
the half. The lac app. i. gave 113 deg. as the power or tension it had acquired
after division; and the air app. ii. gave 121 deg., minus 7 deg., or 114 deg., as the
force it possessed from what it retained of the divisible charge of 290 deg..
These two numbers should evidently be alike, and they are very nearly so,
indeed far within the errors of experiment and observation, but these
numbers differ very much from 145 deg., or the force which the half charge
would have had if app. i. had contained air instead of shell-lac; and it
appears that whilst in the division the induction through the air has lost
176 deg. of force, that through the lac has only gained 113 deg..

1259. If this difference be assumed as depending entirely on the greater
facility possessed by shell-lac of allowing or causing inductive action
through its substance than that possessed by air, then this capacity for
electric induction would be inversely as the respective loss and gain
indicated above; and assuming the capacity of the air apparatus as 1, that
of the shell-lac apparatus would be 176/113 or 1.55.

1260. This extraordinary difference was so unexpected in its amount, as to
excite the greatest suspicion of the general accuracy of the experiment,
though the perfect discharge of app. i. after the division, showed that the
113 deg. had been taken and given up readily. It was evident that, if it really
existed, it ought to produce corresponding effects in the reverse order;
and that when induction through shell-lac was converted into induction
through air, the force or tension of the whole ought to be _increased_. The
app. i. was therefore charged in the first place, and its force divided
with app. ii. The following were the results:

App. i. Lac. App. ii. Air.
. . . . 0 deg.
215 deg. . . . .
204 . . . .
Charge divided.
. . . . 118
118 . . . .
. . . . 0 after being discharged.
0 . . . . after being discharged.