All these swarming fancies unite in the Medusa of the Uffizii. Vasari's story of an earlier Medusa, painted on a wooden shield, is perhaps an invention; and yet, properly told, has more of the air of truth about it than anything else in the whole legend. For its real subject is not the serious work of a man, but the experiment of a child. The lizards and glow-worms and other strange small creatures which haunt an Italian vineyard bring before one the whole picture of a child's life in a Tuscan dwelling--half castle, half farm--and are as true to nature as the pretended astonishment [106] of the father for whom the boy has prepared a surprise. It was not in play that he painted that other Medusa, the one great picture which he left behind him in Florence. The subject has been treated in various ways; Leonardo alone cuts to its centre; he alone realises it as the head of a corpse, exercising its powers through all the circumstances of death. What may be called the fascination of corruption penetrates in every touch its exquisitely finished beauty. About the dainty lines of the cheek the bat flits unheeded. The delicate snakes seem literally strangling each other in terrified struggle to escape from the Medusa brain. The hue which violent death always brings with it is in the features; features singularly massive and grand, as we catch them inverted, in a dexterous foreshortening, crown foremost, like a great calm stone against which the wave of serpents breaks.
The science of that age was all divination, clairvoyance, unsubjected to our exact modern formulas, seeking in an instant of vision to concentrate a thousand experiences. Later writers, thinking only of the well-ordered treatise on painting which a Frenchman, Raffaelle du Fresne, a hundred years afterwards, compiled from Leonardo's bewildered manuscripts, written strangely, as his manner was, from right to left, have imagined a rigid order in his inquiries. But this rigid order would have been little in [107] accordance with the restlessness of his character; and if we think of him as the mere reasoner who subjects design to anatomy, and composition to mathematical rules, we shall hardly have that impression which those around Leonardo received from him. Poring over his crucibles, making experiments with colour, trying, by a strange variation of the alchemist's dream, to discover the secret, not of an elixir to make man's natural life immortal, but of giving immortality to the subtlest and most delicate effects of painting, he seemed to them rather the sorcerer or the magician, possessed of curious secrets and a hidden knowledge, living in a world of which he alone possessed the key. What his philosophy seems to have been most like is that of Paracelsus or Cardan; and much of the spirit of the older alchemy still hangs about it, with its confidence in short cuts and odd byways to knowledge. To him philosophy was to be something giving strange swiftness and double sight, divining the sources of springs beneath the earth or of expression beneath the human countenance, clairvoyant of occult gifts in common or uncommon things, in the reed at the brook-side, or the star which draws near to us but once in a century. How, in this way, the clear purpose was overclouded, the fine chaser's hand perplexed, we but dimly see; the mystery which at no point quite lifts from Leonardo's life is deepest here. But it is [108] certain that at one period of his life he had almost ceased to be an artist.