A new ego is now fully substituted for the old.

In other and more violent forms of disease (dementia) the power of connecting the past and present may disappear altogether, and nothing but the _disjecta membra_ of an ego remain.
* * * * * Enough has, perhaps, been said to show how much of uncertainty and of self-deception enters into the processes of memory.

This much-esteemed faculty, valuable and indispensable though it certainly is, can clearly lay no claim to that absolute infallibility which is sometimes said to belong to it.

Our individual recollection, left to itself, is liable to a number of illusions even with regard to fairly recent events, and in the case of remote ones it may be said to err habitually and uniformly in a greater or less degree.

To speak plainly, we can never be certain on the ground of our personal recollection alone that a distant event happened exactly in the way and at the time that we suppose.