When one knows another's opinion it can't help influencing one's judgment.
I will, if you please, at once commence my researches, with Lecoq's assistance." As the old fellow spoke, his little gray eyes dilated, and became brilliant as carbuncles.

His face reflected an internal satisfaction; even his wrinkles seemed to laugh.

His figure became erect, and his step was almost elastic, as he darted into the inner chamber.
He remained there about half an hour; then came out running, then re-entered and then again came out; once more he disappeared and reappeared again almost immediately.

The magistrate could not help comparing him to a pointer on the scent, his turned-up nose even moved about as if to discover some subtle odour left by the assassin.

All the while he talked loudly and with much gesticulation, apostrophising himself, scolding himself, uttering little cries of triumph or self-encouragement.