“My other dream is of being at a brilliant gathering in my night-garments.  People don’t seem to notice me there at first, and then pretty soon somebody points me out, and they all begin to look at me suspiciously, and I can see that they are wondering who I am and why I am there in that costume.  Then it occurs to me that I can fix it by making myself known.  I take hold of some man and whisper to him, ’I am Mark Twain’; but that does not improve it, for immediately I can hear him whispering to the others, ‘He says he is Mark Twain,’ and they all look at me a good deal more suspiciously than before, and I can see that they don’t believe it, and that it was a mistake to make that confession.  Sometimes, in that dream, I am dressed like a tramp instead of being in my night-clothes; but it all ends about the same—­they go away and leave me standing there, ashamed.  I generally enjoy my dreams, but not those three, and they are the ones I have oftenest.”

Quite often some curious episode of the world’s history would flash upon him—­something amusing, or coarse, or tragic, and he would bring the game to a standstill and recount it with wonderful accuracy as to date and circumstance.  He had a natural passion for historic events and a gift for mentally fixing them, but his memory in other ways was seldom reliable.  He was likely to forget the names even of those he knew best and saw oftenest, and the small details of life seldom registered at all.

He had his breakfast served in his room, and once, on a slip of paper, he wrote, for his own reminder: 

The accuracy of your forgetfulness is absolute—­it seems never to fail.  I prepare to pour my coffee so it can cool while I shave—­and I always forget to pour it.

Yet, very curiously, he would sometimes single out a minute detail, something every one else had overlooked, and days or even weeks afterward would recall it vividly, and not always at an opportune moment.  Perhaps this also was a part of his old pilot-training.  Once Clara Clemens remarked: 

“It always amazes me the things that father does and does not remember.  Some little trifle that nobody else would notice, and you are hoping that he didn’t, will suddenly come back to him just when you least expect it or care for it.”

My note-book contains the entry: 

    February 11, 1907.  He said to-day: 

    “A blindfolded chess-player can remember every play and discuss the
    game afterward, while we can’t remember from one shot to the next.”

    I mentioned his old pilot-memory as an example of what he could do
    if he wished.

    “Yes,” he answered, “those are special memories; a pilot will tell
    you the number of feet in every crossing at any time, but he can’t
    remember what he had for breakfast.”

    “How long did you keep your pilot-memory?” I asked.

    “Not long; it faded out right away, but the training served me, for
    when I went to report on a paper a year or two later I never had to
    make any notes.”