He was founder and director of the Bordeaux Observatory for more than 25 years until his death. He discovered Wolf–Rayet stars together with Charles Wolf in 1867. Awarded the Janssen Medal from the French Academy of Sciences in 1891.
- AN 172 (1906) 111//112 (in French)
- ApJ 25 (1906) 53
- Obs 29 (1906) 332 (one paragraph)
- PASP 18 (1906) 280 (one sentence)
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