Eratosthenes' short poem Hermes is to be regarded as a hymn, in which Hermes' deeds were narrated in the form of an epyllion: episodes from the god's childhood are the core, but, as it is suggested by POxy 3000, there are others possibly related to his later life and even to his descendants. The survival of the poem is studied, its content analysed and a full discussion is provided on all the excerpts preserved in scholia and learned works and on grossly multilated papyrus fragments (POxy 3000 and probably POxy 2521).