I have no theory to offer, but trust that among the readers of ST. NICHOLAS some may be found who have penetrated to the "true inwardness" of this interesting problem, and will give us a complete and scientific explanation of it. Yours truly, H. H. H. * * * * * BEVERLY, OHIO. DEAR ST. NICHOLAS: I have read with considerable interest the letters in ST. NICHOLAS for February concerning curve-pitching. I am a boy who takes great interest in base-ball, and have many times pitched curves. I have seen persons, and see them yet, who firmly maintain that a ball cannot be curved, even when they have ocular demonstration of the fact. But that has nothing to do with what I have to say. I have studied the diagram of my anonymous friend, and am convinced that he is exactly wrong. With the following diagrams I shall show which way a ball curves with a given rotation, and give my theory of the curve: [Illustration] Suppose, as in the letter published, the ball moves one hundred feet per second, and revolves so that the equator moves around at the same rate. Then, in the first diagram, the friction at B is greatest, and at D is 0. But instead of curving as my anonymous friend demonstrates, it will curve in exactly the _opposite_ direction; namely, in the same direction in which it rotates. I have appended diagram 2, simply to show the curve where the friction is 0 at B and greatest at D. Then it will curve as indicated. I have a short theory, namely: In the first diagram, the more rapid movement of B compresses the air on that side, while at D it is in its normal state. Hence the pressure at B more than counterbalances that at D, and, as it were, shoves the ball in the direction of the side D, thus producing the curve. In the 2d diagram, the letters B and D interchange in the theory. I would like to hear more about this subject. Very respectfully yours, F. C. J. * * * * * BIRMINGHAM, MICH. DEAR ST. NICHOLAS: I have read with great interest the articles in the October, December, and February numbers, about curve-pitching. I have had quite a good deal of experience in the "one,-two,-three,-and-out" line myself, and have also, for the last two or three years, been able to make others have the same experience, by putting them out, in the same way. Therefore, I venture a reply to the explanation in the February number, backing my statement by the experience of many eminent curve-pitchers, and also by the story in the October number of "How Science Won the Game." [Illustration]