Transcriber’s notes:
In the text version, italics are represented by _underscores_, and bold and black letter text by =equals= symbols. Superscripts are represented by ^{} and subscripts by _{}
Missing or incorrect punctuation has been repaired.
Inconsistent spelling and hyphenation have been left as printed.
Greek words in the text can be rendered onto ascii as follows:—
The following changes have been made
| p. 79. | emananting changed to emanating |
| p. 142. | Rolandshay changed to Ronaldshay |
| p. 285. | montony changed to monotony |
| p. 299. | Ronaldsha changed to Ronaldshay |
| p. 318. | Index, Paris, Matthew reference changed from p. 23. to 213. |
| p. 322.(the Index of Illustrations) | Fresner's changed to Fresnel's |
| p. 322. | Cordouan is used but the illustration caption uses Cordova. This has been left as printed. |
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