In treating this subject, I shall not occupy space in outlining the proper scheme of building and interior arrangement for a great library, with its many distinct departments, for such institutions are the exceptions, while most libraries come within the rule of very moderate size, and comparatively inexpensive equipment. The first requisite for a public library, then, is a good location. It is important that this should be central, but it is equally important that the building should be isolated--that is, with proper open space on all sides, and not located in a block with other buildings. Many libraries have been destroyed or seriously damaged by fire originating in neighboring buildings, or in other apartments in the same building; while fires in separate library buildings have been extremely rare. It would be a wise provision to secure a library lot sufficiently large in area to admit of further additions to the building, both in the rear and at the side; and with slight addition to the cost, the walls and their supports may be so planned as to admit of this. Committees are seldom willing to incur the expense of an edifice large enough to provide for very prolonged growth of their collection; and the result is that the country is full of overcrowded libraries, without money to build, and prevented from expanding on the spot because no foresight was exercised in the original construction or land purchase, to provide for ready increase of space by widening out, and removing an outer wall so as to connect the old building with the new addition. If a library has 10,000 volumes, it would be very short-sighted policy to plan an edifice to contain less than 40,000, which it is likely to reach in from ten to forty years. The next requisite to a central and sufficient site is that the location must be dry and airy. Any low site, especially in river towns, will be damp, and among the enemies of books, moisture holds a foremost place. Next, the site should afford light on all sides, and if necessary to place it near any thoroughfare, it should be set back so as to afford ample light and ventilation in front. It need hardly be said that every library building should be fire-proof, after the many costly lessons we have had of the burning of public libraries at home and abroad. The material for the outside walls may be brick or stone, according to taste or relative cost. Brick is good enough, and if of the best quality, and treated with stone trimmings, is capable of sufficiently ornate effects, and is quite as durable as any granite or marble. No temptation of cheapness should ever be allowed to introduce wood in any part of the construction: walls, floors, and roof should be only of brick, stone, iron, or slate. A wooden roof is nothing but a tinder-box that invites the flames.