bronchitis, interfere with this test.

Williamson [Footnote: Williamson: Ant. Jour. Med. Sc., April, 1915,
p. 492.] believes that we cannot determine the heart strength
accurately unless we have some method to note the exact position of
the diaphragm, and he has devised a method which he calls the
teleroentgen method. With this apparatus he finds that a normal
heart responds to exercise within its power by a diminution in size.
The same is true of a good compensating pathologic heart. He thinks
that a heart which does not so respond by reducing its size after
exercise has a damaged muscle, and compensation is more or less
impaired.

Practical conclusions to draw from the foregoing suggestions are:

1. An enlargement of the heart after exercise can be well shown only
by fluoroscopic examination, and then best by some accurate method
of measurement.

2. The blood pressure should be immediately increased by exercise,
and after such exercise should soon return to the normal before the
exercise. If it goes below the normal the heart is weak, or the
exercise was excessive.

3. The pulse rate should increase with exercise, but not
excessively, and should within a reasonable time return to normal.

4. The stethoscope will show whether or not the normal sounds of the
heart become relatively abnormal after exercise. If such was the
fact, though the abnormality was not permanent, heart insufficiency