Chris Curnow (1937–2023) the Project Manager at Distributed Proofreaders who selected this book, and more than 2200 others, to be preserved as free digital transcriptions by Project Gutenberg. This book was written based on notes from which the author gave lectures. Consequently, words may have multiple spelling variations or inconsistent hyphenation. These have been left unchanged unless indicated below. Obsolete spelling was retained. Obvious printing errors, such as backwards, upside down, reversed, dropped, or partially printed letters and punctuation, were …
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