Transcriber's Note: Underscores "_" before and after a word or phrase indicate _italics_ in the original text, however, they are also used to designate a subscript. Equal signs "=" before and after a word or phrase indicate =bold= in the original text. Carat characters "^" are used to designate a superscript. Small capitals have been converted to SOLID capitals. Illustrations have been moved so they do not break up paragraphs. Old or antiquated spellings have been preserved. Typographical errors have been silently corrected but other variations in spelling and punctuation remain unaltered. THE GASES OF …
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