me height as in the last splash.
There was sometimes noticed, as seen in Fig. 9, a tendency in the water
to flow up past the milk, which, still comparatively unmixed with water,
rides triumphant on the top of the emergent column. The greater relative
thickness of this column prevents it splitting into drops, and Figs. 10
and 11 show it descending below the surface to form the hollow of Fig.
12, up the sides of which an annular film of milk is carried (Figs. 12
and 13), having been detached from the central mass, which descends to
be torn again, this time centrally into a well-marked vortex ring.

SERIES III.

_The Splash of a Drop, followed in detail by Instantaneous
Illumination._

Diameter of Drop, 1/5 inch. Height of Fall, 1 ft. 5 in.

[Illustration: 1

[Tau] = 0 sec.]

[Illustration: 2

[Tau] = .0314 sec.]

[Illustration: 3

[Tau] = .0317 sec.]

[Illustration: 4

[Tau] = .0389 sec.]

[Illustration: 5

[Tau] = .0498 sec.]

[Illustration: 6

[Tau] = .0551 sec.]

[Illustration: 7

[Tau] = .0759 sec.]

[Illustration: 8

[Tau] = .0901 sec.]

[Illustration: 9]

[Illustration: 10]

[Illustration: 11]

[Illustration: 12

[Tau] = .295 sec.]

[Illustration: 13]

[Illustration: 14]

If we keep to the same size of drop and increase the fall to something
over a yard, no great change occurs in the nature of the splash, but the
emergent column is rather higher and thinner and shows a tendency to
split into drops.

When, however, we double the volume of the drop and raise the height of
fall to 52 inches, the splash of Series IV. is obtained, which is
beginning to assume quite a different character. The raised rim of the
previous series is now developed into a hollow shell of considerable
height, which tends to close over the drop. This shell or dome is a
characteristic feature of all splashes made by large drops falling from
a considerable height, and is extremely beautiful. In the splash at
present under consideration it does not always succeed in closing
permanently, but opens out as it subsides, and is followed by the
emergence of the drop (Fig. 8). In Fig. 9 the return wave overwhelms the
drop for an instant, but it is again seen at the summit of the column in
Fig. 10.

SERIES IV.

_The Splash of a Drop, followed in detail by Instantaneous
Illumination._

Diameter of Drop, 1/4 inch. Height of Fall, 4 ft. 4 in.

[Illustration: 1

[Tau] = 0 sec.]

[Illustration: 2

[Tau