Transcriber’s Note:

This e-text is based on the 1920 edition. Punctuation errors have been tacitly corrected. The Table of Contents has been completed to match the text. Inconsistent hyphenation and spelling (e.g., ‘every-day’/‘everyday’; ‘formulæ’/‘formulae’) have been retained. Large tables have been split and rearranged.

The following typographical errors have been corrected:

# p. 6: ‘sublinary’ → ‘sublunary’; ‘towhich’ → ‘to which’
# p. 62: ‘Shakspeare’ → ‘Shakespeare’
# p. 107: ‘intuite’ → ‘intuit’
# p. 132: ‘Sagitarius’ → ‘Sagittarius’
# p. 135: ‘Viola’ → ‘Voila’