The first edition, which this edition is designed to reproduce, contains a few typographical and other errors corrected in later editions (e. g. that of 1866). For clarity, several readings from later editions are used in this text; all are marked with brackets. In only one case (a tarriff being 'subversion' in the first edition and 'supervision' in others) did the changes produce a significant difference in meaning, and the context clearly supports the latter as the correct reading.