For a long while my chemical studies have lain in abeyance. In order to revive my interest, and to make a decisive stroke, I resume the study of the problem of making gold. The starting-point of the investigation consists in the question: Why does sulphate of iron in a solution of choloro-aurate of sodium precipitate gold? The answer is, because iron and sulphur are essential constituents of gold. The proof is that all natural compounds of sulphur and iron contain more or less gold. So I begin to experiment with solutions of sulphate of iron.
One morning I awoke with the idea of making a trip into the country, though it is quite against my tastes and my habits. When I, more by accident than design, reach the station of Montparnasse, I take the train for Meudon. I go into the village itself, which I visit for the first time, traverse the main street, and turn to the right into a narrow alley confined by walls on both sides. Twenty steps before me I see half-buried in the ground the figure of a Roman knight in grey iron armour. It looks very well modelled, but, as I approach, I see that it is only rough metal-smelting.
But I hold my illusion fast, since it pleases me. The knight looks towards the wall, and following the direction of his gaze I notice something written on the mortar with a piece of coal. It looks like the letters F and S interlaced, which are the initials of my wife's name. She loves me still! The next moment I see, as by a flash, that it is the chemical symbol for ferrum (iron) and sulphur, and the secret of gold lies revealed before my gaze. I search the ground and find two leaden seals fastened together by a string. One displays the initials V.P., the other, a king's crown. Without committing myself to a further interpretation of this adventure, I return to Paris with the lively impression of having experienced something bordering on the marvellous.
In my fireplace I burn coals which, because of their round and regular shape, are called "monks' heads." One day when the fire is nearly extinguished I take out a mass of coal of fantastic shape. It resembles a cock's head with a splendid comb joined to what looks like a human trunk with twisted limbs. It might have been a demon from some mediæval witches' sabbath.
The second day I take out again a fine group of two gnomes or drunken dwarfs, who embrace each other while their clothes flutter in the wind. It is a masterpiece of primitive culture.
The third day it is a Madonna and Child in the Byzantine style, of incomparable beauty of outline. After I have drawn copies of all three in black chalk, I place them on my table. A friendly painter visits me; he regards the three statuettes with growing curiosity, and asks who has "made" them. In order to try him, I mention the name of a Norwegian sculptor. "No," he says, "I should rather be inclined to ascribe them to Kittelsen, the famous illustrator of the Swedish legends."
I do not believe in demons, and yet I wish to see the impression which my little figures make on the sparrows who generally take their crumbs from my window-sill. So I place them there. The sparrows are frightened and remain aloof. There is then some likeness in the figures which they can distinguish, and some reality in this conjunction of dead material and fire.
The sun, as it warms my little figures, makes the demon with the cock's head collapse. This reminds me of the country-people's saying that if the dwarfs wait too long till sunrise, they die.