He had sufficient sense to realise that he knew nothing about her character.
All he saw of it might be merely superficial.
For instance, Mathilde would not have missed mass on Sunday for anything in the world. She accompanied her mother there nearly every time.
If when in the salon of the Hotel de La Mole some indiscreet man forgot where he was, and indulged in the remotest allusion to any jest against the real or supposed interests of Church or State, Mathilde immediately assumed an icy seriousness.
Her previously arch expression re-assumed all the impassive haughtiness of an old family portrait.
But Julien had assured himself that she always had one or two of Voltaire's most philosophic volumes in her room.
He himself would often steal some tomes of that fine edition which was so magnificently bound.
By moving each volume a little distance from the one next to it he managed to hide the absence of the one he took away, but he soon noticed that someone else was reading Voltaire.
He had recourse to a trick worthy of the seminary and placed some pieces of hair on those volumes which he thought were likely to interest mademoiselle de La Mole.
They disappeared for whole weeks.
M. de La Mole had lost patience with his bookseller, who always sent him all the spurious memoirs, and had instructed Julien to buy all the new books, which were at all stimulating.
But in order to prevent the poison spreading over the household, the secretary was ordered to place the books in a little book-case that stood in the marquis's own room.
He was soon quite certain that although the new books were hostile to the interests of both State and Church, they very quickly disappeared.
It was certainly not Norbert who read them.
Julien attached undue importance to this discovery, and attributed to mademoiselle de la Mole a Machiavellian role.
This seeming depravity constituted a charm in his eyes, the one moral charm, in fact, which she possessed.
He was led into this extravagance by his boredom with hypocrisy and moral platitudes.
It was more a case of his exciting his own imagination than of his being swept away by his love.
It was only after he had abandoned himself to reveries about the elegance of mademoiselle de la Mole's figure, the excellent taste of he dress, the whiteness of her hand, the beauty of her arm, the disinvoltura of all her movements, that he began to find himself in love.
Then in order to complete the charm he thought her a Catherine de' Medici.
Nothing was too deep or too criminal for the character which he ascribed to her.
She was the ideal of the Maslons, the Frilairs, and the Castanedes whom he had admired so much in his youth.
To put it shortly, she represented in his eyes the Paris ideal.
Could anything possibly be more humorous than believing in the depth or in the depravity of the Parisian character?
It is impossible that this trio is making fun of me thought Julien.
The reader knows little of his character if he has not begun already to imagine his cold and gloomy expression when he answered Mathilde's looks.
A bitter irony rebuffed those assurances of friendship which the astonished mademoiselle de la Mole ventured to hazard on two or three occasions.
Piqued by this sudden eccentricity, the heart of this young girl, though naturally cold, bored and intellectual, became as impassioned as it was naturally capable of being.
But there was also a large element of pride in Mathilde's character, and the birth of a sentiment which made all her happiness dependent on another, was accompanied by a gloomy melancholy.
Julien had derived sufficient advantage from his stay in Paris to appreciate that this was not the frigid melancholy of ennui.
Instead of being keen as she had been on at homes, theatres, and all kinds of distractions, she now shunned them.
Music sung by Frenchmen bored Mathilde to death, yet Julien, who always made a point of being present when the audience came out of the Opera, noticed that she made a point of getting taken there as often as she could.
He thought he noticed that she had lost a little of that brilliant neatness of touch which used to be manifest in everything she did.
She would sometimes answer her friends with jests rendered positively outrageous through the sheer force of their stinging energy.
He thought that she made a special butt of the marquis de Croisenois.
That young man must be desperately in love with money not to give the go-by to that girl, however rich she maybe, thought Julien.
And as for himself, indignant at these outrages on masculine self-respect, he redoubled his frigidity towards her.
Sometimes he went so far as to answer her with scant courtesy.
In spite of his resolution not to become the dupe of Mathilde's signs of interest, these manifestations were so palpable on certain days, and Julien, whose eyes were beginning to be opened, began to find her so pretty, that he was sometimes embarrassed.
"These young people of society will score in the long run by their skill and their coolness over my inexperience," he said to himself.
"I must leave and put an end to all this."
The marquis had just entrusted him with the administration of a number of small estates and houses which he possessed in Lower Languedoc.
A journey was necessary; M. de la Mole reluctantly consented. Julien had become his other self, except in those matters which concerned his political career.
"So, when we come to balance the account," Julien said to himself, as he prepared his departure, "they have not caught me.
Whether the jests that mademoiselle de la Mole made to those gentlemen are real, or whether they were only intended to inspire me with confidence, they have simply amused me.
"If there is no conspiracy against the carpenter's son, mademoiselle de la Mole is an enigma, but at any rate, she is quite as much an enigma for the marquis de Croisenois as she is to me.
Yesterday, for instance, her bad temper was very real, and I had the pleasure of seeing her snub, thanks to her favour for me, a young man who is as noble and as rich as I am a poor scoundrel of a plebeian.
That is my finest triumph; it will divert me in my post-chaise as I traverse the Languedoc plains."
He had kept his departure a secret, but Mathilde knew, even better than he did himself, that he was going to leave Paris the following day for a long time.
She developed a maddening headache, which was rendered worse by the stuffy salon. She walked a great deal in the garden, and persecuted Norbert, the marquis de Croisenois, Caylus, de Luz, and some other young men who had dined at the Hotel de la Mole, to such an extent by her mordant witticisms, that she drove them to take their leave.