| Author | Hal Clement |
| Copyright Holder | Hal Clement |
| First Published by | Robert Hale |
| Publisher | Penguin Books |
| Imprint | Penguin Science Fiction |
| Printed by | Cox & Wyman |
| Format | Paperback |
| Language | English |
| Location | United Kingdom |
| Copyright | 1954 |
| This Edition Published | 1963 |
| Pages / Font | 199 pages / Monotype Times |
| Price | 3/6 |