Title: The art of spacing
Description: An extended essay on the proper use of white space in typeset material.  White space can be the margins of a page, spacing between paragraphs, spacing between lines of type (leading), spacing between words (word spacing), or spacing between letters within words (letter spacing).  The books sets forth a general principle of typesetting that the spaces between words on a page should be as close to equal as they can be made (assuming the right margin is justified).  The book also advocates the use of only one space after a period, question mark, and exclamation point.  (This is probably one of the earliest books about typography to advocate this practice.)
Subjects: Graphic design (Typography), Typesetting, Printing, Letter spacing