THE VIVARIUM,
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