A belief in demoniacal possession has existed in many lands and throughout the ages, and many and conflicting theories of explanation have been advanced by anthropologists and writers on psychology, hypnotism, etc. Some of these Dr. Nevius has answered, and, as I think, success- fully; and on the whole his mind seems inclined to the view that as yet no theory has been advanced which so well accords with the facts as the simple and unquestioning conclusion so universally held by the Christians of Shantung, viz: that evil spirits do in many instances possess or control the mind and will of human beings.