Just as there were supposed to be several Pans and Fauns, so there were many Silenuses, whose father was called Papposilenus ("Daddy Silenus"), represented as completely covered with hair and more animal in appearance.
The question of the real existence of incubi and succubi, whom the Romans identified with the fauns, was gravely discussed by the fathers of the church; and in 1484 Innocent III.
Pan, Silenus, the Satyrs and the Fauns were either capriform or had some part of their bodies shaped like that of a goat.
Forest trees, no less than cereals, have their indwelling spirits; the fauns and satyrs of classical Literature were goat-footed and the tree spirit of the Russian peasantry takes the form of a goat; in Bengal and the East Indies wood-cutters endeavour to propitiate the spirit of the tree which they cut down; and in many parts of the world trees are regarded as the abode of the spirits of the dead.
His work on The Secret Commonwealth of Elves, Fauns and Fairies, left in MS. and incomplete (the remainder is in the Laing MSS., Edinburgh University library), was published (a hundred copies) in 1815 by Sir Walter Scott, and in the Bibliotheque de Carabas (Lang) there is a French translation.