were deserted, or second, when they were crowded. In other words, he
gave two imaginary instances to illustrate the manner in which
bloodhounds are able to follow a trail. Obviously these two hypothetical
cases are sufficiently plausible and typical to explain the idea.

If a bloodhound is brought to the scene of the crime within a
reasonable length of time after it has been committed, and the dog
has been properly trained, he will unfailingly run down the
criminal, provided, of course, that thousands of feet have not
tramped over the ground.

If, for instance, a crime were committed at Twelfth and Walnut
streets at 3 o'clock in the morning, when few persons are on the
street, a well-trained bloodhound would take the trail of the
criminal at daybreak and stick to it with a grim determination that
appears to be uncanny, and he would follow the trail as swiftly as
if the hunted man had left his shadow all along the route.

But let the crime be committed at noon when the section is alive
with humanity and remain undiscovered until after dark, then the
bloodhound is put at a disadvantage and his wonderful powers would
fail him, no doubt.

INCIDENTS. Narrative articles, such as personal experience stories,
confessions, and narratives in the third person, consist almost entirely
of incidents. Dialogue and description are very frequently employed in
relating incidents, even when the greater part of the incident is told
in the writer's own words. The incidents given as examples of narrative
beginnings on pages 135-37 are sufficient to illustrate the various
methods of developing incidents as units.