The text of this e-book has mostly been preserved in its original form including some inconsistency of hyphenation and use of diacritics (aeriform/aëriform). Three spelling typos have been corrected (arrangment → arrangement, pully → pulley, dye → die) as have typos in equations on pages 40 and 43. Some missing punctuation has been corrected silently (periods, commas, incorrect quotes). Footnotes have been positioned below the relevant paragraphs. In this plain text version, italic text is denoted by _underscores_ and bold text by *asterisks*. A caret (^) indicates that the following character is superscripted, e.g. D^2 (D squared).…
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