LA CROSSE BALL.--The official ball for the game of La Crosse is made of sponge rubber, sometimes leather covered (white). It is very slightly smaller in size than a baseball, and about the same weight. The Intercollegiate La Crosse Association of the United States specifies a ball weighing about 5-3/4 ounces, with circumference of 8 inches. The National Amateur La Crosse Union of Canada specifies a weight of from 4-1/2 to 5 ounces, and circumference of not less than 7-3/4 nor more than 8 inches. The best balls cost sixty-five cents each.
MEDICINE BALL.--Medicine balls are leather covered and of greater weight than any others used in the gymnasium. These balls were devised to give exercise of a vigorous character, particularly for the abdominal and other trunk muscles, and afford some of the most hygienic exercise to be had in the gymnasium. Medicine balls vary considerably in size and weight. The usual balls measure from 10 to 16 inches in diameter, and weigh from 4 to 12 pounds. They cost from $4.50 to $15, those with laced leather covers being more expensive than those with sewn covers.
OAT SACKS.--Oat sacks as here described were devised by Dr. R. A. Clark and Mr. A. M. Chesley, to be used in place of medicine balls for adult players. In addition they may be used for many bean-bag games. Oat sacks are made of heavy (10 oz.) duck. They are circular in shape, 14 inches in diameter when finished. Two circles of this size are stitched around the edge, except for an opening where the oats are inserted. The bag is then turned and stitched a second time. They are then filled with four pounds of oats each.
PLAYGROUND BALL.--For the game of Playground Ball there is used a ball that in size is between a baseball and indoor baseball. Usually balls of from 12 to 14 inches in circumference (of this type of construction) are called playground balls, and those from 15 to 17 inches, indoor baseballs. Because of their size, these balls cannot be batted as far as the usual baseball, and this and their softer texture make them especially useful for limited areas. This same type of soft ball may be had in the smaller size of the regulation baseball. The construction is the same as for indoor baseballs--a wound ball covered with soft white leather, the whole being firm, but more elastic and yielding than a baseball.