 He was known to have also been a believer in the conservation of endangered species.Thirteen poems from his cycle "Tristesses" ("Sorrows"), were set to music by composer Lili Boulanger in 1914 under the title "Clairières dans le ciel" ("Clearings in the Sky") a title Jammes had given to an assorted collection of poetry of which "Tristesses" was a part.The whole cycle was composed for soprano, flute and piano by Michel Bosc.