shoe salesman, who has spent your evenings in a Brooklyn flat,
drawing up plans for a poultry plant, I have only to apologize for
any interference that this book may cause with your highly
fascinating amusement.

To the poultryman already in the business, or to the man who is
planning to engage in the business for reasons equivalent to those
which would justify his entering other occupations of the
semi-technical class, such as dairying, fruit growing or the
manufacture of washing machines, I wish to say it is for you that
"The Dollar Hen" is primarily written.

This book does not assume you to be a graduate of a technical
school, but it does bring up discussions and use methods of
illustration that may be unfamiliar to many readers. That such
matter is introduced is because the subject requires it; and if it
is confusing to the student he will do better to master it than to
dodge it. Especially would I call your attention to the diagrams
used in illustrating various statistics. Such diagrams are
technically called "curves." They may at first seem mere crooked
lines, if so I suggest that you get a series of figures in which you
are interested, such as the daily egg yields of your own flock or
your monthly food bills, and "plot" a few curves of your own. After
you catch on you will be surprised at the greater ease with which
the true meaning of a series of figures can be recognized when this
graphic method is used.

I wish to call the farmer's attention to the fact that poultry
keeping as an adjunct to general farming, especially to general
farming in the Mississippi Valley, is quite a different proposition