It was five in the morning. The rays of the rising sun began to shine in at the windows of Granite House. It promised to be a fine day, and this day was to be poor Herbert's last! A ray glanced on the table placed near the bed. Suddenly Pencroft, uttering a cry, pointed to the table. On it lay a little oblong box, of which the cover bore these words:-- "Sulphate of Quinine." CHAPTER ELEVEN. INEXPLICABLE MYSTERY--HERBERT'S CONVALESCENCE--THE PARTS OF THE ISLAND TO BE EXPLORED--PREPARATIONS FOR DEPARTURE--FIRST DAY--NIGHT--SECOND DAY--KAURIES--A COUPLE OF CASSOWARIES--FOOTPRINTS IN THE FOREST--ARRIVAL AT REPTILE POINT. Gideon Spilett took the box and opened it. It contained nearly two hundred grains of a white powder, a few particles of which he carried to his lips. The extreme bitterness of the substance precluded all doubt; it was certainly the precious extract of quinine, that pre-eminent antifebrile. This powder must be administered to Herbert without delay. How it came there might be discussed later. "Some coffee!" said Spilett. In a few moments Neb brought a cup of the warm infusion. Gideon Spilett threw into it about eighteen grains of quinine, and they succeeded in making Herbert drink the mixture. There was still time, for the third attack of the malignant fever had not yet shown itself. How they longed to be able to add that it would not return! Besides, it must be remarked, the hopes of all had now revived. The mysterious influence had been again exerted, and in a critical moment, when they had despaired of it. In a few hours Herbert was much calmer. The colonists could now discuss this incident. The intervention of the stranger was more evident than ever. But how had he been able to penetrate during the night into Granite House? It was inexplicable, and, in truth, the proceedings of the genius of the island were not less mysterious than was that genius himself. During this day the sulphate of quinine was administered to Herbert every three hours. The next day some improvement in Herbert's condition was apparent. Certainly, he was not out of danger, intermittent fevers being subject to frequent and dangerous relapses, but the most assiduous care was bestowed on him. And besides, the specific was at hand; nor, doubtless, was he who had brought it far-distant! and the hearts of all were animated by returning hope. This hope was not disappointed. Ten days after, on the 20th of December, Herbert's convalescence commenced. He was still weak, and strict diet had been imposed upon him, but no access of fever supervened. And then, the poor boy submitted with such docility to all the prescriptions ordered him! He longed so to get well! Pencroft was as a man who has been drawn up from the bottom of an abyss. Fits of joy approaching to delirium seized him. When the time for the third attack had passed by, he nearly suffocated the reporter in his embrace. Since then, he always called him Dr Spilett.