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ISBN 0-486-21083-9  $7.95 in U.S.A.

Transcriber’s Note:

Words may have multiple spelling variations or inconsistent hyphenation in the text. These have been left unchanged, as were obsolete and alternative spellings. Eleven misspelled words were corrected.

One footnote was moved to the end of the chapter. Obvious printing errors, such as partially printed letters and punctuation, were corrected. Final stops missing at the end of sentences and abbreviations were added.

In the List of Literature Cited, entry for [Burtch, Verdi], the page number was changed from “340-241” to “340-341.”