or menagerie for the Colosseum. The arches have been laterally closed,
leaving small apertures of communication. The vivarium consists of
eight immense arches two stories high, formed from blocks of
travertine. The substructions occupy a large extent of the convent
gardens. A massive portion supports the elegant medieval campanile, of
the thirteenth century, one of the best preserved in Rome. _Beneath
this_ are some subterranean chambers hewn out of the tufa, supposed to
be