Both volumes of Moncure Daniel Conway's excellent treatise on demons and devilry are presented here complete. Written in the 19th century, this lengthy and thorough text documents the various manifestations of demons and devils in the Christian religion. The forms they take, and the means by which they appear in the physical world, are cataloged. How they correspond to actual phenomena, such as death and pestilence, is likewise noted. Conway draws upon various writings within the Biblical scriptures, together with later works published in the Middle Ages and subsequent centuries, to arrive at his own comprehensive treatment of the subject. The second volume of the work concerns devils. Various figures such as Ahriman and Visw mitra receive chapters, in which the writings about them are quoted to form a complete image of their behavior and meanings. Appearances of devils in later works, such as the diabolical Mephistopheles in Goethe's Faust, are also cataloged.