She was so interested in these strangers that the desire came to know more about them and their surroundings, and she made numerous trips up the Cross River by Mission steamer and canoe and visited the townships on the banks. On one of these journeys she felt for the first time that death was at her side. A dispute had arisen between Okoyong and Umon, and the Umon people, strong in the belief that she would mete out justice even against her own tribe, begged her to come and decide the quarrel. It was a long day's journey for the best walkers, "but," said she, "if they can do it in a day, so can I." A well-manned canoe was, however, sent for her, and she proceeded in it with some of the twin- children. They were speeding down a narrow creek leading into the river, a man standing with his paddle at the bow to negotiate the canoe past the logs and trees, when a hippopotamus, which was attended by its young, rose immediately in front and attacked it savagely. The man at the bow instantly thrust the paddle into the gaping mouth, and shoved the canoe violently to one side. Mary seized some large tin basins with covers, which the natives used for holding cooked food, and placed them outside in front of the part where the children were sitting, and where the infuriated hippopotamus was trying to grip and upset the canoe. These curious weapons succeeded in baffling the monster. Several times it made a rush and failed. The shouting, the snapping of the jaws, the whirling of the paddles, the cries of the children--"_O Abasi ibom Ete nyaña nyin mbok O!_" ("O God, Father, please save us, Oh!")--almost unnerved her. The hippo at last made for the stern, where some of the paddlers beat it off and kept it at bay long enough to enable the others to turn the canoe and rush it out of its reach. But she could not now afford to be long away from her station, for the utmost vigilance was required to combat the evils around her. In spite of British laws and gunboats twin-murder continued in secret. She noticed, however, that where the people came within the influence of the Mission their fears gradually disappeared. What pleased her was that women to whom she had been kind voluntarily brought in twins to her that would otherwise have been killed. One day she and Mr. Alexander were sitting at breakfast when a woman walked in, and without remark placed a large calabash on the table. Mary thought it was a dish of native food and said, "You have come too late, we have just finished." Still the woman was silent. Mary opened the calabash and found that it contained two twin boys.