or more ems on the left all the lines following. When space will allow, the matter so treated may be preceded and followed by a full white line.
For unleaded composition, even in the broadest measure, the one-em indention of the lines following the first line is enough to give the matter distinction. For leaded matter an indention of one and a half ems is common, and two or more ems may be used for a summary in very small type; but two ems may be found too much for widely leaded lines of large type. A three-em indention in open matter makes composition lopsided and unsightly. The slight projection of the first line and the slight recession of the following lines are enough to arrest attention. Summaries of contents under a
CHAPITRE II.
chapter heading, which are usually set in small type, may receive indention of the same width as that used for the regular paragraphs of the text. Indexes, directories, dictionaries, and all similar forms of composition abounding in short paragraphs, each beginning with a word intended to arrest attention, should have the first line of each paragraph the full width of the measure, and all following lines of that paragraph indented. With small type the indention of one en is enough.
