However, the question as to balls turning in the air has been definitely settled by the American base-ball players. In this game the pitcher throws one full-pitch after another to the batsman, and even if the latter happen to be one of the best and most experienced in the game he misses a considerable proportion of these full-pitches. And why? because of the twist or curl in the air which the pitcher imparts to the ball. A very interesting account is given by Mr. R. A. Proctor in ‘Longman’s Magazine’ for June 1887 of a well-known English cricketer’s failure to strike the full-pitches of one of the best American pitchers. Time after time the bat struck the air and nothing else; and this was simply owing to the curl the pitcher put on the ball. Mr. Proctor scientifically explains the curl in the air, and it may be of interest to insert a short extract from his article:-- When a ball (or in fact any missile) is advancing rapidly through the air, there is formed in front of it a small aggregation of compressed air. (In passing we may remark that the compressed air in front of an advancing cannon ball has been rendered discernible--we can hardly say visible--by instantaneous photography.) In shape the cushion of air is conical or rather conoidal, if the ball is advancing without spin; and therefore it resists the progress of the ball equally on all sides, and only affects the ball’s velocity. The same is the case if the ball is spinning on an axis lying along its course. But in the case we have to consider, where the ball is spinning on an axis square to its course, the cushion of compressed air formed by the advancing ball has no longer this symmetrical shape. On the advancing side of the spinning surface the air cannot escape so readily as it would if there were no spin; on the other side it escapes more readily than it would but for the spin. Hence the cushion of air is thrown towards that side of the ball where the spin is forwards and removed from the other side. The same thing then must happen as where a ball encounters a cushion aslant. A ball driven squarely against a very soft cushion plunges straight into it, turning neither to the right nor to the left, or if deflected at all (as against a billiard cushion) comes straight back on its course; but if driven aslant against the cushion, it is deflected from the region of resistance. So with the base ball. As the cushion of air against which it is advancing is not opposed squarely to it, but is stronger on one side than on the other, the ball is deflected from the region of greatest resistance.