The original Table of Contents failed to connect reliably with the text. The original has been severely overhauled, without further comment here.

Precise horizontal spacing of words is essential in this book. But precise horizontal spacing is difficult to attain in an ebook, given the constraints necessarily imposed upon us. Browser support of html and css varies considerably; support for specialized Unicode space characters varies; the ebook product must be readable on many different devices with widely varying screen sizes; and users may choose from many widely different fonts. The following example of a catalogue entry is taken from page [90].

— Same. Erkl. von O. Heine. Berlin, 1857. 8º.

It should not look like the following, from which the required spacing has been removed:

Same. Erkl. von O. Heine. Berlin, 1857. 8º.

If these two examples look alike, or if strange characters appear in the first example, then a different choice of browser or device is recommended.