My mother had a good deal of trouble with me, but I think she enjoyed it. She had none at all with my brother Henry, who was two years younger than I, and I think that the unbroken monotony of his goodness and truthfulness and obedience would have been a burden to her but for the relief and variety which I furnished in the other direction. I was a tonic. I was valuable to her. I never thought of it before, but now I see it. I never knew Henry to do a vicious thing toward me, or toward any one else--but he frequently did righteous ones that cost me as heavily. It was his duty to report me, when I needed reporting and neglected to do it myself, and he was very faithful in discharging that duty. He is "Sid" in "Tom Sawyer." But Sid was not Henry. Henry was a very much finer and better boy than ever Sid was. It was Henry who called my mother's attention to the fact that the thread with which she had sewed my collar together to keep me from going in swimming, had changed color. My mother would not have discovered it but for that, and she was manifestly piqued when she recognized that that prominent bit of circumstantial evidence had escaped her sharp eye. That detail probably added a detail to my punishment. It is human. We generally visit our shortcomings on somebody else when there is a possible excuse for it--but no matter, I took it out of Henry. There is always compensation for such as are unjustly used. I often took it out of him--sometimes as an advance payment for something which I hadn't yet done. These were occasions when the opportunity was too strong a temptation, and I had to draw on the future. I did not need to copy this idea from my mother, and probably didn't. Still she wrought upon that principle upon occasion.