Another very remarkable instance of mirage, my uncle says, has been more than once seen at Reggio, in the straits of Messina, where it is called the Fata Morgana. When the rays of the sun form an angle of about 45° with the sea, and that the bright surface of the water in the bay is not disturbed by wind or current, if the spectator be placed with his back to the sun, there suddenly appears on the water the most incomprehensible variety of objects—pilasters, arches, and castles, lofty towers and extensive palaces, with all their balconies and windows—or perhaps trees, vallies, and plains, with their herds and flocks—armies of men, on foot and on horseback, and many other strange objects; all in their natural colours, and all in action, passing rapidly in succession along the surface of the sea. But if, besides the circumstances before described, the atmosphere happens to be loaded with a dense vapour, which the sun had not previously dispersed, the observer will behold a representation of the same objects in the air, as if traced there on a curtain; though not so distinct or well defined as those on the sea. These curious appearances were fancifully called by the Italians, the castles of the Fairy Morgana.
My uncle says that the celebrated Dr. Wollaston has proved, by some very ingenious experiments, that they arise from the irregular refraction of the rays of light, in passing through contiguous portions of air, of different densities. One of these experiments he was so good as to shew us; and as it is so simple, that Marianne can easily try it, I will endeavour to describe it here.
He put a little clear syrup into a square phial, and then poured about an equal quantity of water into it, over the syrup. The phial was set on the table, and having placed a printed card about an inch behind it, he made us observe that when we looked through the syrup, or through the water, the letters on the card appeared erect; but, that when they were seen through that part where the two fluids were gradually mixing together, the letters were equally distinct, but inverted. A similar effect, he said, may be produced with hot and cold water, or even by two portions of cold and heated air; and to shew us this, he performed another very easy experiment. He placed two of the library chairs back to back, and about a foot apart; he connected the tops of the chairs with two bits of strong wire, and on the wires he laid the kitchen poker, the square end of which he had made red hot. Exactly in the direction of the poker he pinned a large printed A upon the wall, which was about ten feet distant; and then desired us to look at it along the heated poker. We did so, and we all distinctly saw three images of the A, the middle one being inverted, and the two others erect.
Dear mamma, how this reminded me of the day when you first explained to us the meaning of refraction, and shewed us the pretty little experiment of the stick, which appeared to bend just at the surface of the water. How often I now feel the benefit of all your patient instruction, and how often I wish I had your excellent memory, which enabled you to teach us so many things, without having any books to assist you!
20th.—My cousins like Eastern tales just as much as I do—and my uncle speaks of the Arabian Nights’ Entertainments as if he was still a boy. He thinks that they are not only very ingenious, but that many of the apparent wonders, which are related as supernatural, may be easily explained, by means of the chemical and philosophical knowledge which is too generally supposed to be the result of late discoveries. I should like to read over all my favourite tales with him, for the benefit of his explanations. What brought them into my mind now, was a pretty little anecdote which I once heard him tell Grace, and which she has just been repeating to me.
In Khorasân, there was a certain old caravanserai, called Zafferounee, which was once so very extensive, as to contain seventeen hundred chambers, besides baths and shops, and besides accommodation for thousands of cattle within its walls. It is said to have been erected by one of those wealthy Eastern merchants, who delighted in perpetuating their names by acts of public utility. While it was building, and a large quantity of straw and clay were mixing up for that purpose on the road near it, a cafilah, consisting of a hundred camels, loaded with saffron, chanced to pass; and one of them, slipping into the clay, fell, and was disabled. Their owner inveighed bitterly against those who by so carelessly doing their work on the public road, had occasioned such a serious loss to him. The merchant, who was himself superintending the progress of the building, on hearing these complaints, inquired what might be the value not only of the camel, which had been disabled, but of all the rest; and purchasing the whole on the spot, ordered the saffron to be tumbled into the clay, and worked up with it, instead of chopped straw. It was from this that the caravanserai obtained the name of Zafferounee, or Saffron.
This rich merchant, however, fell afterwards into difficulties, as might have been expected, from his extravagance, and at last became a beggar. Travelling in search of subsistence, into foreign countries, he happened to visit the place where the camel-driver, now grown immensely rich, lived in splendour. It came to the ears of the latter, that a stranger, in poverty, who spoke of his former riches in Khorasân, was living wretchedly in the town; and suspecting that this might be his old benefactor, he invited him to his house; and after feasting him superbly, induced him to relate his history: when, in concluding it, the unhappy Khorasânee described his destitute condition, the other interrupted him, saying, “How can you call yourself poor, when you are, in reality, a man possessed of great riches?” “Ah! no,” replied the other; “once, indeed, I had much wealth, but all is gone; and I am now a beggar!” On this his host carried him to a secret chamber, which was full of money—“This,” said he, “is all yours; it is the price of the saffron which you so liberally purchased from me: I have traded upon it and become rich, but the original sum I have always reserved as belonging to you; take it now, and live happily.”
Grace is always encouraged to repeat to others the little stories which are told to her: I wish you could have heard her relating this to us before tea.
22d.—Well, I am in actual possession of the old quarry. Having settled all my plans, I at once set to work, and my uncle was so good as to let me have one of the workmen to help me, because he said my ideas were rational. The opening of the quarry fronts the south-west; the rock at the back is high and steep, and a spring, which trickles from it, keeps the part which had been most deeply worked constantly full of water. In this I have put several pretty water-plants—Mr. Biggs, I know, lays a quantity of peat compost in his pond; but though I have not been able to obtain that yet, I have planted the white and the yellow water lily, which the gardener found for me a few miles off. A thick skreen of shrubs has been planted by my uncle’s directions, above the rocks to the north, but no forest trees, for in a short time they would outgrow the place which they ornament only while young.
The middle and southern parts of the quarry are to be sloped and dressed; all the briars have been already taken out, and the loose splinters of the quarry are spread on the surface of the bank. Upon these, the gardener has laid a mixture of peat earth and sand, which he had to spare; and here I intend to have an incomparable bed of strawberries.