And now as to results. It is something to say that in this way 10,000 volumes can be placed within a room of quite ordinary size, all visible, all within easy reach, and without destroying the character of the apartment as a room. But, on the strength of a case with which I am acquainted, I will even be a little more particular. I take as before a room of forty feet in length and twenty in breadth, thoroughly lighted by four windows on each side; as high as you please, but with only about nine feet of height taken for the bookcases: inasmuch as all heavy ladders, all adminicula requiring more than one hand to carry with care, are forsworn. And there is no gallery. In the manner I have described, there may be placed on the floor of such a room, without converting it from a room into a warehouse, bookcases capable of receiving, in round numbers, 20,000 volumes. The state of the case, however, considered as a whole, and especially with reference to libraries exceeding say 20,000 or 30,000 volumes, and gathering rapid accretions, has been found to require in extreme cases, such as those of the British Museum and the Bodleian (on its limited site), a change more revolutionary in its departure from, almost reversal of, the ancient methods, than what has been here described. The best description I can give of its essential aim, so far as I have seen the processes (which were tentative and initial), is this. The masses represented by filled bookcases are set one in front of another; and, in order that access may be had as it is required, they are set upon trams inserted in the floor (which must be a strong one), and wheeled off and on as occasion requires.