The fervent aspirations of his nature could be read in his eyes.

Raoul, concealed in the shadow, divined the many passionate thoughts that established, between the tent of the young ambassador and the balcony of the princess, a mysterious and magical bond of sympathy--a bond created by thoughts imprinted with so much strength and persistence of will, that they must have caused happy and loving dreams to alight upon the perfumed couch, which the count, with the eyes of his soul, devoured so eagerly.
But De Guiche and Raoul were not the only watchers.

The window of one of the houses looking on the square was opened too, the casement of the house where Buckingham resided.

By the aid of the rays of light which issued from this latter, the profile of the duke could be distinctly seen, as he indolently reclined upon the carved balcony with its velvet hangings; he also was breathing in the direction of the princess's apartment his prayers and the wild visions of his love.
Raoul could not resist smiling, as thinking of Madame, he said to himself, "Hers is, indeed, a heart well besieged;" and then added, compassionately, as he thought of Monsieur, "and he is a husband well threatened too; it is a good thing for him that he is a prince of such high rank, that he has an army to safeguard for him that which is his own." Bragelonne watched for some time the conduct of the two lovers, listened to the loud and uncivil slumbers of Manicamp, who snored as imperiously as though he was wearing his blue and gold, instead of his violet suit.
Then he turned towards the night breeze which bore towards him, he seemed to think, the distant song of the nightingale; and, after having laid in a due provision of melancholy, another nocturnal malady, he retired to rest thinking, with regard to his own love affair, that perhaps four or even a larger number of eyes, quite as ardent as those of De Guiche and Buckingham, were coveting his own idol in the chateau at Blois.

"And Mademoiselle de Montalais is by no means a very conscientious garrison," said he to himself, sighing aloud..