The text of this book has been preserved in its original form apart from correction of two typographic errors: incidently → incidentally, flouroscopic → fluoroscopic. Inconsistent hyphenation has not been altered. In this transcription italic text is denoted by _underscores_. A caret (^) indicates that the following bracketed characters are superscripted. Footnotes have been numbered and positioned below the relevant paragraphs, and some illustration captions have been moved closer to the relevant text.…
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