"At the suggestion of Dr. Alfred T. Halstead of the faculty of the Springfield, Massachusetts Y.M.C.A. College, the name of Morgan's game was changed from mintonette to volleyball, and like all games, the sport has undergone several rule changes. For instance, before 1921 the ball could be played in the air an unlimited number of times. In the old days, the net was only seven feet high, there was no rotation of players, and reaching over the net to play a ball was not penalized. All these rules have since been modified although the form and spirit of the game have remained unchanged. Y.M.C.A.s in the United States quickly adopted and promoted volleyball and soon it spread to foreign countries. Today it enjoys considerable vogue in South America, Australia, India, the Philippines, Russia, Siberia and the Orient. During the first World War the sport was widely played by American soldiers. Experiments have been conducted to improve the rules and in America today the game is played so widely on playgrounds, in school intramural leagues, gymnasiums and in recreation centers that it has been estimated that four million people now play volleyball."