Underscores “_” before and after a word or phrase indicate _italics_ in the original text. Equal signs “=” before and after a word or phrase indicate =bold= in the original text. Small capitals have been converted to SOLID capitals. Illustrations have been moved so they do not break up paragraphs. Antiquated spellings have been preserved. Typographical and punctuation errors have been silently corrected. The “ADDITIONAL NOTES” section, pages 211 to 226 have been removed as they serve no function in an ebook. FOURTH EDITION, REVISED PHILADELPHIA AND LONDON W. B. SAUNDERS COMPANY 1919…
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