The briefest statement of the salient features of Hudson's hypothesis will suffice to enable me to suggest the irresistible conclusion that the prime factor in the formation of all opinion, collective and individual, the chief determinant of conduct, and the greatest motive force in the world, is analogous and co-relative to hypnotic suggestion. Hudson was the first to attempt a clear definition of the rôle and nature of the two elements which constitute the dual mind. For the sake of greater clearness he speaks of these two aspects of mind as though they were two minds, possessing distinctive characteristics and a line of demarcation between the two, clearly defined. To continue in his own words: "Their functions are essentially unlike; each is endowed with separate and distinct attributes and powers; and each is capable, under certain conditions and limitations, of independent action." The author then distinguishes the two by designating the one _objective_ and the other _subjective_. It is unfortunate that he makes use of a nomenclature in which these terms are slightly perverted from their legitimate meaning, or perhaps, as he expresses it, modified and extended, but since he prefers to use them rather than attempt to coin new ones, it will be necessary to employ them with reference to his law; in every case in which these designations are employed in conjunction with the word mind, or printed in italics, they will be used in this sense. They are defined thus: "The objective mind takes cognizance of the objective world. Its media of observation are the five physical senses. It is the outgrowth of man's physical necessities.... Its highest function is that of reasoning."[46] In other words, the objective mind functionates from the brain and is susceptible of anatomical localization, whilst "the subjective mind takes cognizance of its environment by means independent of the physical senses. It perceives by intuition.... It performs its highest functions when the _objective_ senses are in obeyance. In a word, it is that intelligence which makes itself manifest in a hypnotic subject when he is in a state of somnambulism."[47] Whether we call it soul or subjective mind matters not; what matters is the fact that in all psychic phenomena there is sufficient evidence to show that the two aspects of mind interact according to certain observable principles. The main principle affecting man's mental organization on which Hudson builds his hypothesis is the Law of Suggestion, first discovered by Liébeault, the founder of the Nancy School of hypnotism, during his researches in 1866. It is this: that hypnotic subjects are constantly amenable to the power of suggestion. This proposition may be said to have been demonstrated as true beyond all possibility of doubt.