The caption titles on both score and part indicate that these two pieces are Op. 18 (without the "bis"), no. 1 & 2.
The pl. no.: 15001 HL and 15002 HL appear only on p. 1 of the part and score respectively ; the pl. no. S. 1832 indicates that the music was first issued in 1847 by Schonenberger, from plates acquired by Lemoine in 1875.
No. 1. L'Éolienne -- No. 2. Le mouvement perpetuel.