The plates of De Rossi, Perret, and, indeed, all illustrations of the catacombs, exhibit frequent examples of the same destructive superstition.
Marchi, Monumenti delle arti cristiane primitive (Rome, 1844); Raoul Rochette, Tableau des catacombes de Rome (2nd ed., Paris, 1853) Perret, Les Catacombes de Rome (Paris, 1855) - a sumptuous folio work, but not always accurate; Roller, Les Catacombes de Rome (Paris, 1881); V.
In other furnaces the ore rests on a series of horizontal plates, and either remains on the same plate throughout the operation (0111vier and Perret furnace), or is passed from plate to plate by hand (Maletra), or by mechanical means (Spence and M`Dougall).
Perret, Boffille de Juge, comte de Castres, et la republique de Venise (1891); F.
(From Perret.)' admirably adapted both by the intricacy of their labyrinthine passages, in which any one not possessing the clue would be inevitably lost, and the numerous small chambers and hidingplaces at different levels which might be passed unperceived in the dark by the pursuers.