It is easy to imagine to what surprising effects of light and shade such vastness of proportion lends itself on the occasion of illuminations. These were made both inside (Holy Thursday and Good Friday) and outside (Easter, and June 29). The outside illumination required the use of forty-four hundred lanterns, and of seven hundred and ninety-one torches, and the help of three hundred and sixty-five men. It has not been seen since 1870. I have heard from old friends who remember the illumination of the interior, which was given up more than half a century ago, that no sight could be more impressive. In the darkness of the night, a cross studded with thirteen hundred and eighty lights shone like a meteor at a prodigious height, while the multitude crowding the church knelt and prayed in silent rapture. Before leaving the Vatican let me answer a doubt which may naturally have occurred to the mind of the reader, as it has long perplexed the author. After the many vicissitudes to which the place has been subject, from the time of Elagabalus to the pillage of the constable de Bourbon, can we be sure that the body of the founder of the Roman Church is still lying in its grave under the great dome of Michelangelo, under the canopy of Urban VIII., under the high altar of Clement VIII.? After considering the case from its various aspects, and weighing all the circumstances which have attended each of the barbaric invasions, I cannot see any reason why we should disbelieve the popular opinion. The tombs of S. Peter and S. Paul have been exposed but once to imminent danger, and that happened in 846, when the Saracens took possession of their respective churches and plundered them at leisure. Suppose the crusaders had taken possession of Mecca: their first impulse would have been to wipe the tomb of the Prophet from the face of the earth, unless the keepers of the Kaabah, warned of their approach, had time to conceal or protect the grave by one means or another. Unfortunately, we know very little about the Saracenic invasion of 846; still it seems certain that Pope Sergius II. and the Romans were warned days or weeks beforehand of the landing of the infidels, by a despatch from the island of Corsica. Inasmuch as the churches of S. Peter and S. Paul were absolutely defenceless, in their outlying positions, I am sure that steps were taken to conceal or wall in the entrance to the crypts and the crypts themselves, unless the tombs were removed bodily to shelter within the city walls. An argument, very little known but of great value, seems to prove that the relics were saved.