axis of said shaft. In this tube
or receptacle is placed a weight, such as a ball, which is free to
roll or slide back and forth in the tube. The effect of this
arrangement is, that as the shaft revolves, the weight will drop
alternately toward opposite ends of the tube, and its stroke, as it
brings up against either end, will be distinctly heard by the observer
as well as felt by him if, as is usually the case, the apparatus when
in use is held by him. By counting the strokes which occur during a
given period of time, the number of revolutions during that period can
readily be ascertained, and from that the velocity of the current to
be measured can be computed in the usual way.

When the apparatus is submerged in water, by a rope held by the
observer, it will at once adjust itself to the direction of the
current. The force of the current, acting against the wings or blades
of the propeller wheel, puts the latter in revolution, and the tube,
D, will be carried around, and the sliding weight, according to the
position of the tube, will drop toward and bring up against
alternately opposite ends of said tube, making two strokes for every
revolution of the shaft.

[Illustration]

* * * * *

THE FLOWER INDUSTRY OF GRASSE.

A paper on this subject was read before the Chemists' Assistants'
Association on March 8, by Mr. F.W. Warrick, and was listened to with
much interest.

Mr. Warrick first apologized for presenting a paper on such a
frivolous subject to men who had shown themselves such ardent
advocates of the higher pharmacy, of the "ologies" in preference to
the groceries, perfumeries, and other "eries." But if perfumery could
not hope to take an elevated position in the materiae pharmaceuticae, it
might be accorded a place as an adjunct, if only on the plea that
those also serve who only stand and wait.

Mr. Warrick mentioned that his family had been connected with this
industry for many years, and that for many of the facts in the paper
he was indebted to a cousin who had had twenty years' practical
experience in the South, and who was present that evening.

GRASSE.

The town of Grasse is perhaps more celebrated than any other for its
connection with the perfume industry in a province which is itself
well known to be its home.

This, the department of the Alpes Maritimes, forms the southeastern
corner of France. Its most prominent geographical features are an
eleva