To reach the interior it is necessary to enter a grange that has been built at right angles to the rock, and in it to mount a ladder to another granary that occupies a floor of solid rock. Thence a second ladder leads into the caves. Formerly, however, the ascent was made by steps cut in the side of the cliff, and openings from within enabled the garrison with pikes to precipitate below any who were daring enough to venture up the steps uninvited.
The ladder gives admission through a broken door cut in the rock into a long vaulted hall, that was formerly floored across so as to convert it into two storeys. [Footnote: Actually the doorway and three lower openings look into the dark granary. In the illustration I have shown them as letting light in, as intended originally.] The lower storey or basement opens on the left-hand side into a second cave, and the upper by a passage cut in the rock communicated with another range of chambers looking out of the face of the crag by artificial windows. Immediately in front of one entering the hall is the portal of admission to another very large hall that had originally well-shaped windows, and a door leading on to the wooden balcony, but this has all been broken away forming the ragged opening seen from below.
In 1534 Calvin was staying in the adjoining parish of S. Saturnin with a canon of the cathedral of Angoulême, who had a good library, and was disposed to favour him. The house is pointed out, but it has been rebuilt or altered. A cavern there is also shown to which Calvin retired to meditate on his Reform. It is now a cellar full of casks, wheelbarrows, and rubbish. It was never a very pleasing resort, and he preferred to come to La Roche Corail where, in the cavern just described, he had more space, and less likelihood of being disturbed. And here it was that he wrote his "Institute of the Christian Religion." One is disposed to rest here for awhile and muse, and consider what a manufactory of explosives this cavern was. From this vaulted chamber was launched that doctrine which was to wreck nearly every church in France and drench the soil in blood. I do not in the least suppose that Calvin saw any beauty in the view through the gap in the rock--not in the island below with its poplars and willows whose branches trail in the bottle-green waters of the Charente--not in the lush meadows with the yellow flags fluttering by the waterside--not in the grey towers of Nersac castle and church rising above dark woods, flushed orange in the setting sun against a purple sky. I do not suppose that he noticed the scent of the wallflowers growing out of every fissure wafted in on the summer air. There was logic thought in his head, but no poetry in his heart, no sweetness in his soul. He looked across in the direction of Angoulême, and wished he had a ladder and a hammer that he might smash the serene face of the Saviour looking down on the city from the western gable of the cathedral. Five and twenty years must elapse before that wondrous domed pile was to be wrecked by the Huguenots, his disciples. But here it was, in this cavern, that he elaborated his system of reform, treating Christianity as a French peasant treats an oak tree, pollarding it, and lopping off every lateral, natural outgrowth. Assuredly, many a volatile superstition had lodged in its branches, and many a gross abuse couched under its shadow. But these might have been scared away without mutilating the tree till it was reduced to a stump. He desired, doubtless, to bring back the Church to the condition in which he supposed it had been when born. But one cannot reduce an adult to the simplicity and innocence of childhood by stripping off all his clothes, and denying him the conventional figleaf.