own desk and apparatus or he may be required
to pass from desk to desk. The latter method is preferable.

When a store room is used the services of a man are required to
distribute and afterward to collect. If the apparatus is permanently
distributed, a large room is necessary, but the labor of collecting and
distributing is done away with.

There are certain general experiments intended to show the use of
measuring instruments which all students must perform. To illustrate the
use of the indicator I have selected an elementary class, although the
instrument is equally applicable to all classes of experiments.

Having selected a suitable room, tables may be placed against the walls
between the windows and at other convenient places. Shallow closets are
built upon these tables against the wall; they have glass doors and are
fitted with shelves properly spaced. A large number of light wooden
boxes are prepared, numbered from one up to the limit of the storage
capacity of the closets. A number corresponding to that upon the box is
placed upon the shelf, so that each one after removal may be returned to
its proper place without difficulty. On the front of the box is a label
upon which is written the experiment to be performed or the name of the
apparatus whose use is to be learned, references to various books, which
may be found in the laboratory library, and the apparatus necessary for
the experiment, which ought to be found in the box. If any parts of the
apparatus are too large to be placed in the box, the label indicates by
a number where it may be found in the storage case.

It is evident that, instead of the above arrangement, all the boxes can
be stacked in piles in a general store room. The described arrangement
is preferable, as it prevents confusion in collecting and distributing
apparatus when the class is large.

_The Indicator_ (see figure).--Some device is evidently desirable to
direct the work of a laboratory with the least trouble and friction
possible. I have found that the old fashioned "peg board," formerly used
in schools to record the demerits of scholars, modified as in the
following description, leaves nothing to be desired.

The requirements of such an instrument are these: It must show the names
of the members of the class; it must contain a full list of the
experiments to be performed; it must refer the student to the book and
page where information in reference to the experiments or apparatu