The main problem to be solved is the disposition of the various streams of traffic, so that people may reach expeditiously the places to which their daily vocations call them. This problem may be postponed, or it may be solved inadequately; but sooner or later, as experience teaches, some solution must be found. Postponement multiplies ultimate cost, and meantime creates a constantly increasing burden of discomfort and loss of business. True economy, therefore, dictates that the present moment, when already congestion is a menace to the commercial progress of the city, shall be seized upon as the proper time to begin a thorough regeneration of the street system within the Heart of Chicago. Fortunately, the general lines on which the changes should be made are determined by opportunities so obvious that the development of a dignified and thoroughly convenient composition would seem to come about quite naturally. All that is necessary is to take advantage of existing possibilities by combining the various elements into a consistent whole. By so doing a unified city, wherein each portion will have organic relation to all other portions, will result. In considering the Heart of Chicago as a single composition it is desirable to begin with the base line. Obviously this is found in Michigan Avenue, which is already a broad thoroughfare, and is now in process of being widened to a width of 130 feet throughout that portion which is bordered by Grant Park. At the present time, Michigan Avenue is the main connecting thoroughfare between the North and South Sides; but it is much more than this. Office buildings, hotels, clubs, theatres, music-halls, and shops of the first order as to size and architecture line the western side of the avenue, the Park opposite their fronts insuring light, air, and an agreeable outlook. So desirable has this thoroughfare become that extensions of it to the north or the south must enhance the value of the abutting real estate, because of the increased opportunities such extensions will create for continuing the building of structures of the highest class. Michigan Avenue is probably destined to carry the heaviest movement of any street in the world. Any boulevard connection in Michigan Avenue which fails to recognize the basic importance of the avenue will be a waste of money and energy. Any impairment of the capacity of this street at any point along its entire front, any weakening of this foundation, is an error of the first magnitude.