Page:The practice of typography; correct composition; a treatise on spelling, abbreviations, the compounding and division of words, the proper use of figures and nummerals by De Vinne, Theodore Low, 1828-1914.djvu/173

 Before this selection of face and exact grading of the sizes of type can be properly determined in a book that has to be kept within a prescribed number of pages, some calculation should be made (not of necessity minutely exact) of the space that will be taken up by each part.

The style of type that has been determined for the text should regulate that of all its minor parts. A text in old style should have its extracts and footnotes in smaller sizes of the same face or family of old style. Extracts in the Elzevir face, or even in the Caslon face, when inserted in a text of modernized old style, are as discordant as they would be for a text set in modern-cut letter. Foot-notes in bold-face of modern cut under a page of light-face text make another unpleasing discord. All subheadings, side-headings, and running titles should also be in agreement with the types of the text. They may be and often must be more conspicuous, as is imperative in the side-headings of dictionaries and gazetteers, but they need not be so dense and black as to make painful contrast.

The impropriety of putting together types of radically different styles on the same page is generally acknowledged, but it is not so well understood that types of the same style, but of different shape or form (as they are when bold forms oppose