He added Folk Stories to his book because Africans don't tell Stories to their children anymore. Folk Stories are for both Adult and Children. African Folk Stories are to teach lessons and morals. Folk Stories bring families together and it helps the parents to know the mental capacities of their children.
Long time ago in the Americas, some former Slaves, both Male and female who had gained their freedom became known as Apalo. Some became visiting Story tellers. They were going from one Plantation to another and telling African Moonlight Stories to both African and European children. Apalo's were found in Brazil, Cuba, Trinidad and Tobago e.t.c.