There Balzac developed quickly. He learnt the struggle of a business life, the duel between man and man, through which thousands pass without gaining anything except business acuteness, but which introduced the great psychologist to hundreds of new types, and showed to his keen, observant eyes man, not in society or domesticity, but in undress, fighting for life itself, or for all that makes life worth living. In the Rue de Lesdiguieres he had struggled with himself, striving in cold and hunger to gain the mastery of his art. Here he battled with others; and since, except on paper, he never possessed business capacity, he failed and went under; but by his defeat he paved the way to future triumph. He passed through an experience possibly unique in the career of a man of letters, one which imparts the peculiar flavour of business, money, and affairs to his books, and which fixed on him for all his days the impression of restless, passionate, thronging humanity which he pictures in his books. The abyss between his early romantic novels and such a book as the "Peau de Chagrin" is immeasurable, and cannot be altogether accounted for by any teaching, however valuable, or even by the strong influence which intercourse with Madame de Berny exercised. Something else definite must have happened to him--some great opening out and development, which caused a sudden appearance on the surface of hitherto latent, unworkable powers. This forcing-process took place at his first contact with the war of life; and though he bore the scars of the encounter as long as he lived, he grew by its clash, ferment, and disaster to his full stature. In "La Maison du Chat-qui-pelote," "Illusions Perdues," and "Cesar Birotteau" he gives different phases of this life, spent partly in the printer's office and partly in the streets, rushing anxiously from place to place and from person to person, trying vainly by interviews to avert the impending ruin.