Autograph Letter Signed ('L. Lalanne') to 'Monsieur l'abbé Moigno', ed. "Cosmos".

12mo, 1 p, 7 lines. Good, with the address on the verso of the second leaf of the bifolium, which also carries the broken red wafer. Written in French. An interesting communication between two of the leading lights of French nineteenth-century mathematics. Lalanne describes Moigno as 'toujours le juge bienveillant et aimable que je connais depuis si longtemps'.