discharge was in the air, when the interval there was less than
that expressed in the first or third columns of figures; and all the
discharge in the gas, when the interval in air was greater than that in the
second or fourth column of figures. At intermediate distances the discharge
was occasionally at both places, i.e. sometimes in the air, sometimes in
the gas.

_____________________________________________________________________
| | |
| | Interval _p_ in parts of an inch |
|_________________|___________________________________________________|
| | | |
| | When the small ball B | When the small ball B |
| Constant inter- | was inductric and | was inductric and |
| val _n_ between | _positive_ the | _negative_ the |
| B and D = 1 | discharge was all | discharge was all |
| inch | at _p_ in at _n_ in | at _p_ in at _n_ in |
| | air before the gas | air before the gas |
| | after | after |
|_________________|_________________________|_________________________|
| | _p_ = | _p_ = | _p_ = | _p_ = |
|In Air | 0.10 | 0.50 | 0.28 | 0.33 |
|In Nitrogen | 0.30 | 0.65 | 0.31 | 0.40 |
|In Oxygen | 0.33 | 0.52 | 0.27 | 0.30 |
|In Hydrogen | 0.20 | 0.10 | 0.22 | 0.24 |
|In Coal Gas | 0.20 | 0.90 | 0.20 | 0.27 |
|In Carbonic Acid | 0.61 | 1.30 | 0.30 | 0.15 |
|_________________|____________|____________|____________|____________|

1508. These results are the same generally, as far as they go, as those of
the like nature in the last series (1388.), and confirm the conclusion that
different gases restrain discharge in very different proportions. They are
probably not so good as the former ones, for the glass jar not being
varnished, acted irregularly, sometimes taking a certain degree of charge
as a non-conductor, and at other times acting as a conductor in the
conveyance and derangement of that charge. Another cause of difference in
the ratios is, no doubt, the relative sizes of the discharge balls in air