In calculating the space required for books shelved as has been heretofore suggested, it may be approximately stated that every one thousand volumes will require at least eighty to one hundred square feet of floor measurement. Thus, a library of 10,000 volumes would occupy an area of nearly one thousand square feet. But it is necessary to provide also for the continual growth of the collection. To do this, experience shows that in any flourishing public library, space should be reserved for three or four times the number of volumes in actual possession. If rooms are hired for the books, because of inability to build, the library should be so arranged as to leave each alternate shelf vacant for additions, or, in the more rapidly growing divisions, a still greater space. This will permit accessions to be shelved with their related books, without the trouble of frequently moving and re-arranging large divisions of the library. This latter is a very laborious process, and should be resorted to only under compulsion. The preventive remedy, of making sure of space in advance, by leaving a sufficiency of unoccupied shelves in every division of the library, is the true one. In some libraries, a separate reading-room for ladies is provided. Mr. W. F. Poole records that in Cincinnati such a room was opened at the instance of the library directors. The result was that the ladies made it a kind of social rendezvous, where they talked over society matters, and exhibited the bargains made in their shopping excursions. Ladies who came to study preferred the general reading room, where they found every comfort among well conducted gentlemen, and the "ladies' reading-room" was abandoned, as not fulfilling its object. The same experiment in the Chicago Public Library had the same result. Some libraries in the larger towns provide a special reading-room for children; and this accomplishes a two-fold object, namely, to keep the public reading-room free from flocks of little people in pursuit of books under difficulties, and to furnish the boys and girls with accommodations of their own. It may be suggested as an objection, that the dividing line as to age is difficult to be drawn: but let each applicant be questioned, and if falling below twelve, or fifteen, or whatever the age limit may be, directed to the juvenile reading-room, and there need be no trouble. Of course there will be some quite young readers who are gifted with intelligence beyond their years, and who may dislike to be reckoned as children; but library rules are not made to suit exceptions, but for the average; and as no book need be refused to any applicant in the juvenile department, no just cause of complaint can arise.