label of the box is a list of all the apparatus necessary, which he will
find in the box; the label also contains the book references. He
performs the experiment, fills up a blank which he gives to the
instructor, puts all the materials back in the box, replaces the box in
its proper place in the closet and proceeds with the next experiment.
With this indicator there is no difficulty in managing fifty students or
more.

Comparatively little apparatus need be duplicated. Where apparatus is
fixed against a wall a number may be tacked upon the wall and a card
containing the information desired. The procedure is then the same as
with the boxes. The cards on the board being removable, other ones may
be inserted containing information in reference to other boxes having
the same number but containing different materials. There can be no
successful tampering with the board, for the record of experiments
performed is upon the blanks which the students turn in and also in the
individual note books which are written up and given to the instructor
for daily examination.

Lafayette College. J.W. MOORE.

* * * * *




NEW METHOD OF EXTINGUISHING FIRES


This is by George Dickson, of Toronto, Canada, and David Alanson Jones.