The proprietors of the Stock Exchange draw a great part of their revenue, of course, from the entrance fees and subscriptions of the members, who pay a rent, as it were, for their stands in the market-place; and a considerable portion of the revenue comes from the rent of the brokers' offices which form part of the building. The interests of the proprietors are controlled by directors, who are called Trustees and Managers. Before they can be appointed they must have been proprietors for the preceding five years, and must hold at least ten shares at the time of their nomination. Their task, as may easily be imagined, is no light one. They are nine in number, as they have been ever since the present constitution came into force at the beginning of last century. It is theirs to provide a fitting market-place for the important transactions carried on by the members and their clerks, who number about 7,500 in all. To provide accommodation for such a population, with all the requirements of ventilation, heating, and lighting, as well as facilities for work at high pressure, which modern business demands, would tax the organising capabilities of any body of men. The principal officers of the Stock Exchange responsible to the Managers are their Secretary, the Architect and Surveyor, and the General Superintendent. It is not surprising that grumbling criticism is sometimes heard; the matter for surprise is that there is not more of it, especially considering the rapidity of the growth of the number of members, and the difficulties in the way of extending the size of the market-place. These difficulties are constantly being overcome; offices are absorbed into the main area, corridors are swept away, the utmost ingenuity is exercised in the creation of space.