The rigidity of her metallic eyes and their insupportable lustre made him shudder. The beast approached him; he looked at her caressingly, staring into those bright eyes in an effort to magnetize her--to soothe her. He let her come quite close to him before stirring; then with a gentle movement, he passed his hand over her whole body, from the head to the tail, scratching the flexible vertebrae, [Footnote: Vertebrae: the bones of the spinal column.] which divided the yellow back of the panther. The animal slightly moved her tail voluptuously, and her eyes grew soft and gentle; and when for the third time the Frenchman had accomplished this interested flattery, she gave vent to those purrings like as cats express their pleasure; but it issued from a throat so deep, so powerful, that it resounded through the cave like the last chords of an organ rolling along the vaulted roof of a church. The Provencal seeing the value of his caresses, redoubled them until they completely soothed and lulled this imperious creature. When he felt assured that he had extinguished the ferocity of his capricious companion, whose hunger had so luckily been appeased the day before, he got up to leave the grotto. The panther let him go out, but when he reached the summit of the little knoll she sprang up and bounded after him with the lightness of a sparrow hopping from twig to twig on a tree, and rubbed against his legs, arching her back after the manner of a domestic cat. Then regarding her guest with eyes whose glare had somewhat softened, she gave vent to that wild cry which naturalists compare to the grating of a saw. "Madame is exacting," said the Frenchman, smiling. He was bold enough to play with her ears; he stroked her body and scratched her head good and hard with his nails. He was encouraged with his success, and tickled her skull with the point of his dagger, watching for an opportune moment to kill her, but the hardness of the bone made him tremble, dreading failure. The sultana of the desert [Footnote: Why does the author call the tiger the sultana of the desert?] showed herself gracious to her slave; she lifted her head, stretched out her neck, and betrayed her delight by the tranquillity of her relaxed attitude. It suddenly occurred to the soldier that, to slay this savage princess with one blow, he must stab deep in the throat. He raised the blade, when the panther, satisfied, no doubt, threw herself gracefully at his feet and glanced up at him with a look in which, despite her natural ferocity, a glimmer of goodwill was apparent. The poor Provencal, thus frustrated for the nonce, [Footnote: For the nonce: for the present.] ate his dates as he leaned against one of the palm-trees, casting an interrogating glance from time to time across the desert in quest of some deliverer, and on his terrible companion, watching the chance of her uncertain clemency.