But then the doctor was mad upon his own particular subject, and neither heat nor storm would would have kept him back. The sun now had tremendous power, and even his Malay boatmen looked hot; but the doctor's face only shone, and he sat back in the stern, gun in hand, carefully scanning the shore, ready to bring down the first attractive specimen he saw to add to his collection. The boat was well supplied with necessaries, including a waterproof sheet, and a handy tent if he should camp ashore; but the boat was to be for the most part his camping-place; and, according to his preconceived plan, the doctor meant to force his way right up a branch or tributary of the main river--a stream that had never yet been, as far as he knew, explored; and here he was hopeful of making his way close up to the mountains, continuing the journey on foot when the river became too narrow and swift for navigation. In this intent the boat was steadily propelled up-stream, and at the end of the second day the Inche Maida's campong and home had been passed, and unseen they had placed some miles between them and the Princess's people. The Inche Maida was very friendly, but the knowledge that she would perhaps be down before many hours were over at the station, made the doctor fix his time for passing in the dusk of the evening, for he did not wish his movements to reach his wife's ears sooner than he could help, nor yet to be canvassed by his friends. Hence, then, he slept that night with his boat secured to the trunk of a large cocoa-palm, well covered in from the night dew, and with a bit of quinine on the tip of his tongue when he lay down to keep off the fever. Neither he nor his men troubled themselves about the weird noises of the jungle, nor the rushings and splashings that disturbed the river. There were dangerous reptiles and other creatures around, but they did not disturb them; and when the loud roar of a tiger was heard not many yards away, amidst the dense bushes of the shore, the doctor merely turned over and uttered a low grunt, muttering in his sleep about Mrs Bolter breathing so hard. The next morning before the white mist had risen from the river, the Malays were busy with their paddles, and they had gone on about five or six miles when one of the men ceased rowing, and held up his hand to command silence. "A big boat coming down the river pulled by many oars, master," said the man, "a fighting prahu, I think. Shall we hide?" "Hide? no," exclaimed the doctor. "Why?" "It may be an enemy who will make us prisoners, perhaps kill us," said the Malay, softly. "We are thy servants, and we will go on if you say go." "Perhaps I had better not," said the doctor, thoughtfully. "It would spoil the expedition. Hah! yes, I can hear the oars now. But where could we hide?" "If the master bids us, we will place the boat so that no one passing shall see, and we can see all," replied the Malay.