It has been already observed that the definite localization of a mnemonic image is only an occasional accompaniment of what is loosely called recollection.

Hence, error as to the position of an event in the past chain of events would seem to involve the least degree of violation of the confidence which we are wont to repose in memory.

After this, we may proceed to the discussion of the second class, which I may call distortions of the mnemonic picture.

And, finally, we may deal with the most signal and palpable variety of error of memory, namely, the illusions which I have called mnemonic spectra.
_Illusions of Perspective: A.Definite Localization._ In order to understand these errors of mnemonic perspective, we shall have to inquire more closely than we have yet done into the circumstances which customarily determine our idea of the degree of propinquity or of remoteness of a past event.

And first of all, we will take the case of a complete act of recollection when the mind is able to travel back along an uninterrupted series of experiences to a definitely apprehended point.