The most magnificent contribution to the literature of the Catacombs, at least in point of artistic excellence and costliness, is the superb work of M. Perret,[284] in six huge folio volumes, with some five hundred coloured drawings, two thirds of which were never before copied, and as many _fac-simile_ inscriptions. It was prepared under the direction of the French Academy of Inscriptions, and by a vote of the Legislative Assembly of the French Republic of 1851 a grant of one hundred and eighty thousand francs was given to defray the cost. No expense was spared in its production. An able corps of 159 artists and architects were employed for several years in the undertaking. The galleries and _cubicula_ are represented in elaborate drawings, plans, and sections, and many of the frescoes are copied full size. In these latter, however, the artists have injudiciously endeavoured to reproduce the original force, colour, and expression, instead of giving _fac-similes_ of the faded, and often half-obliterated, paintings. Many of the pictures have, therefore, a pre-Raphaelite beauty, which destroys their value as accurate representations of the art of the Catacombs. It is to be regretted that the letter-press which accompanies these plates is not more worthy of the general magnificence of this splendid work. “It is strung together,” says the writer already quoted,[285] “without discrimination or critical research, and conveys a very inaccurate notion of the results which scientific inquiry, as opposed to mere ecclesiastical tradition, has now reached.” We have rarely ventured to make a statement on its authority unless corroborated by more authentic testimony, but many of its accurate drawings of subterranean architecture enhance the value of these pages. All previous explorers, however, are left far behind by the invaluable labours of the Cavaliere De Rossi, the present _custode_ of the Catacombs, and head of the Roman archæological commission. His profound knowledge of Christian antiquities, his unchallenged candour and honesty of statement, his patience and ingenuity in exploration, his scientific method, accurate observation, and careful deductions, 160 place him far beyond any of his predecessors in this fascinating but difficult field of inquiry. While, however, his statements of facts may always be relied upon, his theoretical conclusions must sometimes be received with caution, in consequence of that seemingly inevitable tendency in Roman Catholic writers to discover ancient evidences in favour of their modern belief and practice where they can be found by no one else.