. The last drop of [Fig. 6] seems to indicate the beginning of a departure from this linear relationship. Since such departure has no bearing upon the evaluation of
, discussion of it will not be entered into here, although it is a matter of great interest for the molecular theory.
Attention may also be called to the completeness of the answers furnished by Figs. [5] and [6] to the question raised in [chap. IV] as to a possible dependence of the drag which the medium exerts on the drop upon the amount of the latter’s charge; also, as to a possible variation of the density of the drop with its radius. Thus drops Nos. 27 and 28 have practically identical values of
, but while No. 28 carries, during part of the time, but 1 unit of charge (see [Table X]), drop No. 27 carries 29 times as much and it has about 7 times as large a diameter. Now, if the small drop were denser than the large one, or if the drag of the medium upon the heavily charged drop were greater than its drag upon the one lightly charged, then for both these reasons drop No. 27 would move more slowly relatively to drop No. 28 than would otherwise be the case, and hence
for drop No. 27 would fall below
for drop No. 28. Instead of this the two