Availability
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Overview of available volumes.
| Volume | Year | PG ebook | Scans |
| I | 1871 | [59456] | [1] |
| II | 1872 | [61591] | [2] |
| III | 1873 | [61634] | [3] |
| IV | 1874 | This volume | [4] |
| V | 1875 | In preparation | [5] |
| VI | 1876 | In preparation | [6] |
| VII | 1877 | In preparation | [7] |
| VIII | 1878–’84 | In preparation | [8] |