RIDING and horsemanship are not easy accomplishments, but they give a unique pleasure to those who have once acquired them -a dwindling number in this mechanical age. Miss Eva Christy is an expert on all matters pertaining to the horse; she was the first woman to take up the teaching of riding as a profession, and to train teachers for that profession, and she was the only woman to be appointed military instructor in riding during the war. Tonight she will describe the various seats-civil and military, side-saddle and cross, and so on.