and set on small wheels, pulleys, or rollers, to work
along the trams. Strong handles on the inner side of
each bookcase to draw it out into the passage. Each
of these bookcases would hold 500 octavos; and a room
of 28 feet by 10 would receive 25,000 volumes. A room
of 40 feet by 20 (no great size) would receive 60,000,
It would, of course, be not properly a room, but a
warehouse.