Divisions at the ends of three adjacent lines will not be passed by readers except in extreme cases or in narrow measure.
Divisions on syllables of two letters should be made but rarely.
Spacing and justifying.—The spacing of matter must be governed by the leading.
Solid matter should be spaced with 3-to-em spaces, and when about to divide a word prefer to take in.
Leaded matter should also be spaced with 3-to-em spaces, but when about to divide a word prefer to drive over.
In double-leaded matter en quads should be used and divisions driven over.
Avoid, if possible, the very thin or very wide spacing of the first line of a paragraph.
All lines of composition must be justified so tightly that they will stand unsupported in the stick.
Observe in spacing the various formations of letters. There should be less space between final “y” and initial “w,” for instance, than between final “d” and initial “h;” less between final “o” and initial “c” than between final “f” and initial “b.” When a little extra spacing is necessary, never place it between a comma and the first letter of succeeding word. The spacing between capital letters in headings should also be governed by letter formation.