Few things have been more beautiful than my note book on the Deist Controversy as it fell downward through the waters of the Mediterranean. It dived, like a piece of black slate, but opened soon, disclosing leaves of pale green, which quivered into blue. Now it had vanished, now it was a piece of magical india rubber stretching out to infinity, now it was a book again, but bigger than the book of all knowledge. It grew more fantastic as it reached the bottom, where a puff of sand welcomed it and obscured it from view. But it reappeared, quite sane though a little tremulous, lying decently open on its back, while unseen fingers fidgeted among its leaves.
"It is such a pity" said my aunt, "that you will not finish your work in the Hotel. Then you would be free to enjoy yourself and this would never have happened."
"Nothing of it but will change into something rich and strange," warbled the chaplain, while his sister said "Why it's gone into the water." As for the boatmen, one of them laughed, while the other, without a word of warning, stood up and began to take his clothes off.
"Holy Moses!" cried the Colonel. "Is the fellow mad?"
"Yes, thank him dear," said my aunt: "that is to say tell him he is very kind, but perhaps another time."
"All the same I do want my book back," I complained. "It's for my Fellowship Dissertation. There won't be much left of it by another time."
"I have an idea," said some woman or other through her parasol. "Let us leave this child of nature to dive for the book while we go on to the other grotto. We can land him either on this rock or on the ledge inside, and he will be ready when we return."
The idea seemed good; and I improved it by saying I would be left behind too, to lighten the boat. So the two of us were deposited outside the little grotto on a great sunlit rock that guarded the harmonies within. Let us call them blue, though they suggest rather the spirit of what is clean, cleanliness passed from the domestic to the sublime, the cleanliness of all the sea gathered together and radiating light. The Blue Grotto at Capri contains only more blue water, not bluer water. That colour and that spirit is the heritage of every cave in the Mediterranean into which the sun can shine and the sea flow.
As soon as the boat left I realised how imprudent I had been to trust myself on a sloping rock with an unknown Sicilian. With a jerk he became alive, seizing my arm and saying "Go to the end of the Grotto and I will show you something beautiful."