To sell this book is the smallest part of my trouble.

It is a book that sells itself.
I only need to show it, to sell it.

Wherever it falls open it attracts the attention with a gem of thought or a flower of knowledge, perhaps the language of gems, or the language of flowers, how to cure boils, how to preserve fruit, each page offers something of value to the mind.

A copy of this book in the house is a friend in sickness or in health, a help in business and a companion in pleasure; to the agent it is a source of steady and continuous income.

One copy sells another." "I said before that I don't want another," said Miss Sally shortly.
"Let us talk about something else," said Eliph' Hewlitt, coughing politely behind his hand.