Part I. Making of the treaty -- I. Proposals and developments prior to 1919 -- II. Investigation by the International Joint Commission, 1920 -21 -- III. St. Lawrence Commission of the United States, 1924-26, and the work of the Joint Board of Engineers, 1925-26 -- IV. Canadian National Advisory Committee, 1924-28 -- V. Negotiations of 1928, the Senate Committee of Inquiry, and the Water-Powers reference to the Supreme Court -- VI. Beauharnois concession and development -- VII. Later engineering investigations, and the negotiation of a treaty -- VIII. Proceedings upon the St. Lawrence Treaty Part II. Economic aspects of the waterway -- IX. Problem of appropriate depth -- X. Problem of Canadian need (Reduction of costs of transportation; Traffic capacity of the existing St. Lawrence Canals; Competition of the Oswego-Albany route) -- Part III. Considerations upon the treaty -- XI. Financial settlements underlying the treaty.