"We shall see, doctor," said I.  "I hope you are right."  Just then we reached a small hut, such as is inhabited by Indians.  Jerry declared that he must have a draught of milk, as we saw some cows feeding near, and before the guide could stop him, he had knocked at the door. Instead of the kindly face of an Indian appearing at his summons, out rushed a big, savage-looking negro, and by his angry gestures seemed to inquire what we wanted.