Willy Ley encountered this Mars story in a German translation, and, failing to find the English original (possibly hampered by looking for it under the title Beyond the Zodiac, but Percy Greg was apparently a well-known English author), considered that it might be actually German. The confusion was not helped by the fact that author Greg presents himself as translating a found manuscript. Sam Moskowitz considers it the genesis of the Mars romance so characteristic of the early period of modern science fiction.
- Introductory essay by Sam Moskowitz, from the 1974 Hyperion edition, HNtW 34, 26 May 2017
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