sentences:  Much of the folklore he recorded was a result of oral questioning of individuals.His 1908 book "Llên Gwerin Sir Gaernarfon" ("Caernarfonshire Folklore") is considered his best work; it consists of folk tales from the former Caernarfonshire (now western Conwy and northern Gwynedd), collected from many sources and summarised with his own comments and explanations.However, some of his research is considered by later scholars such as T. Gwynn Jones and Georges Dumézil to have been negligent.