Lying, like every other psychic phenomenon, never occurs fortuitously, but always has its psychic determinants which determine its type and degree. Naturally many of these determinants are quite obvious and readily ascertainable. One has only to recall the lying and deceit practiced by children. But many others, if indeed not most of them, are active in the individual's unconscious motives and accessible objectively as well as subjectively only with great difficulty and by means of special psychological methods. The degree of participation of unconscious motives in lying will be determined in the individual case by the extent of repression necessitated because of social, ethical, and æsthetic considerations. It is for this reason that lying is most prevalent and exhibited with the least amount of _critique_ in those individuals who either have never developed those restraining tendencies which a normal appreciation of social, ethical, and æsthetic consideration demands, or in whom these restraining influences have been weakened or abolished by some exogenous insult to the nervous system--as, for instance, the tendency to fabrication dependent upon chronic alcoholism or morphinism. A beautiful illustration of the latter type is furnished by General Ivolgin in Dostoieffsky's "Idiot." The child's tendency to lying and deceit is dependent to a large extent upon the undeveloped state of those restraining forces. To state, however, that this is the sole mechanism underlying the phenomenon of lying would be to state only half a truth. For it is an undeniable fact that, no matter how strongly endowed an individual may be with ethical or moral feelings, still there comes a time when these are entirely forgotten and neglected; when, finding himself in a stressful situation, the instinctive demands for a most satisfactory and least painful adjustment, no matter at what cost, assert themselves. It is then that the lie serves the purpose of a more direct, less tedious gratification of an instinctive demand. The resort to this mode of reaction, to evasion of real issues for the purpose of gratification of instinctive demands, is not characteristic of man alone, but is quite prevalent even in some very low forms of life. We will have more to say about this later. It is an important tool in the struggle for existence among all living beings; it is one of the mechanisms by means of which the weaker inferior being escapes annihilation at the hands of the stronger, superior being.