he wireless patrol will have to look sharp or the
police will be called upon to find it."

And indeed there were so many distracting things that the four spy
hunters found it difficult not to get lost. At every step something
new and unfamiliar claimed their attention and caused them to pause and
look about.

Captain Hardy let his charges go at their own gait. He paused when
they wanted to look at something, took sharp care of them at crossings,
and told them how to cross the streets so as to avoid accidents. And
ever he kept his eye on them to see that none of the four became
separated from the group. It pleased him to note how quickly they
learned to avoid the traffic and dodge difficulties. Their training in
observation had not been in vain.

To Herald Square the captain led his party. There, in a little eddy of
sidewalk traffic, he drew them together.

"The streets that run lengthwise of the island," he said, "are called
avenues, and the one before you is Sixth Avenue. The station we just
left faces on Seventh Avenue. The cross streets are numbered, and the
one we are on is Thirty-fourth Street. Broadway comes up the island on
a long diagonal. Right here where Broadway, Thirty-fourth Street, and
Sixth Avenue intersect, is one of the busiest corners in the city.
Overhead are two elevated railway tracks. On the ground are six
street-car tracks, crossing one another. Under the surface are two
subway tracks. So you have three layers of people passing and
repassing above or below one another. I want you to remember what I
have said as to the arrangement of the thoroughfares--avenues run north
and south, streets east and west. If you get that thought in your
mind, you won't go very far out of your way.

"And there is one thing more to remember. In some cities, such as
Philadelphia, the street numbers run 100 to each block. Here the
houses are numbered consecutively, and you can't tell by a number where
a house is. But if you should need to know, go to the nearest drug
store. Every New York drug store has a city directory. And in the
back of the directory you will find a table that will show you
approximately where to find the street number you want. Don't forget.
If you are to do effective work, you must become so familiar with New
York that you can find your way around as readily as you can in Central
City. Sometimes it may be necessary for you to go from place to place
in the shortest possibl