There were many other gifts from Sir William Macdonald during this period. In 1909 an attempt was made by a syndicate to purchase the block known as the Joseph property at the southwest corner of the College yard or campus, for the purpose of building an hotel. The Principal was alarmed. He appealed to Sir William, whose pride was great in McGill and in the buildings he had erected. Sir William had no desire that the grounds of McGill should become the backyard of an hotel, however exclusive. He at once purchased the corner, and presented it to the University, thus completing the McGill square and providing a home for the McCord National Museum. Two years later he purchased, as he said, "for a playground for McGill students, the grown-up children of all Canada," the Frothingham, Molson and Law properties, consisting of twenty-five acres, just east of the Royal Victoria Hospital and the Medical Building. This property, known as Macdonald Park, is the athletic centre of the University. In October, 1920, the Stadium in this park was formally opened. It was the gift of Percival Molson, B.A., who graduated in Arts in 1901, and who was killed in action in front of Avion, near Lens, on July 3rd, 1917, while serving as a Captain in the Princess Patricia's Canadian Light Infantry. The McGill Union, erected on Sherbrooke Street, as a centre of student activities, was also the gift of Sir William Macdonald, McGill's greatest benefactor, whose donations to the University during the Principalships of Sir William Dawson and Sir William Peterson amounted to over twelve million and a half of dollars. In 1912 the four affiliated Theological Colleges formed a co-operating Divinity School in affiliation with the University for the instruction of joint classes, and Divinity Hall on University Street was opened.