As Clive Leatherdale points out in his introduction, Mayo's understanding of the laws and theories of such phenomena is concentrated around Karl Von Reichenbach's discovery of an apparently universal force which he called Od or Odylic
. For Mayo the discovery of Odylic
force means that it 'had now become possible to explain ghostly warnings, and popular prophecies, the wonders of natural trance, and of animal magnetism, without having recourse to a single unproven principle' (5).
As Gregory put it: `The odylic
atmosphere of the operator, and that of the subject, interpenetrating each other, and the former predominating over the latter, the subject becomes, for the time, a partaker in the thoughts and feelings of the operator' (p.