cus, or
typhoid germs in milk. But scientific truth, the results of scientific
tests, can be made of everyday use in all class rooms. State and
national headquarters for educators, and all large cities, can afford
to engage scientists to apply vitality tests to school children for the
sake of discovering, in advance of physical breakdown and before
outward symptoms are obvious, what curriculum, what exercise, what
study, recreation, and play periods are best suited to child
development. It will cost infinitely less to proceed this way than to
neglect children or to fit school methods to the loudest, most
persistent theory.

The ergograph is an interesting strength tester. It takes a picture (1)
of the energy exerted, and (2) of the regularity or fitfulness of the
manner in which energy is exerted. Perhaps the time will come when
science and commerce will supply every tintype photographer with an
ergograph and the knowledge to use it. Then we shall hear at summer
resorts and fairs, "Your ergograph on a postal card, three for a
quarter." We can step inside, harness our middle finger to the
ergograph, lift it up and down forty-five times in ninety seconds, and
lo! a photograph of our vitality! If we have strong muscles or good
control, the picture will be like this:

[Illustration: FIG. 1. Ergogram of T.R., a strong, healthy girl,
before taking 40 minutes' work in the gymnasium. Weight used,
3.5 kg. Distance lifted, 151 cm. Work done, 528.5 kg.-cm.]

If weak and nervous, we shall look like this before taking exercise:

[Illustration: FIG. 2. Ergogram of C.E., a weak and somewhat
nervous girl, before taking 40 minutes' work in the gymnasium.
Weight used, 3.5 kg. Distance lifted, 89 cm. Work done, 311.5
kg.-cm.]

And like this after gymnasium exercise:

[Illustration: FIG. 3. Ergogram of C.E. after taking 40 minutes'
work in the gymnasium, showing that the exercise proved very
exhausting. Weight used, 3.5 kg. Distance lifted, 55 cm.]

In Chicago, two of whose girls are above photographed, the physician
was surprised to have four pupils show more strength late in the day
than in the morning. "Upon investigation it was found that the teacher
of the four pupils had been called from school, and that they had no
regular work, but had been sent to another room and employed
themselves, as they said, in having a good time." The chart on page 127
shows the effect of the noon recess and