Hugh Macmillan,
Roman Mosaics; Or, Studies in Rome and Its Neighbourhood
“ John Lateran, between the vestibule and the octagonal area containing the so-called gigantic font in which Constantine was baptized. A very interesting stone hangs suspended from the gilded iron grating which protects the crypt or confessional of St. Laurence, immediately underneath the high altar of the great Basilica of San Lorenzo beyond the Gate. A stone still more remarkable, guarded by a strong iron grating, projects half its bulk from the wall on the right-hand side of the arch which divides the transept from the middle nave in the venerable church of Santa Maria in Trastevere. ”
