_Shell-hearing._--The induction of hallucinatory voices, etc., by listening to a shell. Analogous to crystal-gazing.
_Stigmatisation._--The production of blisters or other cutaneous changes on the hands, feet, or elsewhere, by suggestion or self-suggestion.
_Subliminal._--Of thoughts, feelings, etc., lying beneath the ordinary _threshold_ (_limen_) of consciousness, as opposed to _supraliminal_, lying _above_ the threshold.
_Suggestion._--The process of effectively impressing upon the subliminal intelligence the wishes of some other person. _Self-suggestion_ means a suggestion conveyed by the subject himself from one stratum of his personality to another, without external intervention.
_*Supernormal._--Of a faculty or phenomenon which transcends ordinary experience. Used in preference to the word _supernatural_, as not assuming that there is anything outside nature or any arbitrary interference with natural law.
_Synæsthesia._--See _Secondary Sensations_.
_Synergy._--A number of actions correlated together, or combined into a group.
_Telekinesis._--Used of alleged supernormal movements of objects, not due to any known force.
_*Telepathy._--The communication of impressions of any kind from one mind to another, independently of the recognised channels of sense.
_*Telæsthesia._--Any direct sensation or perception of objects or conditions independently of the recognised channels of sense, and also under such circumstances that no known mind external to the percipient's can be suggested as the source of the knowledge thus gained.
_*Telergy._--The force exercised by the mind of an agent in impressing a percipient,--involving a direct influence of the extraneous spirit on the brain or organism of the percipient.
_Veridical._--Of hallucinations, when they correspond to real events happening elsewhere and unknown to the percipient.
Maior agit deus, atque opera la maiora remittit.
In the long story of man's endeavours to understand his own environment and to govern his own fates, there is one gap or omission so singular that, however we may afterwards contrive to explain the fact, its simple statement has the air of a paradox. Yet it is strictly true to say that man has never yet applied to the problems which most profoundly concern him those methods of inquiry which in attacking all other problems he has found the most efficacious.