“It’s cold, all right,” was Roy’s comment at this moment. “I think there’s ice on the river.”

In spite of the increasing coldness, the Gitchie Manitou made its way without trouble toward the distant camp. There was no wind and, although the boys computed the temperature outside at not less than twenty below zero, the interior of the little cockpit soon became cozy enough. The heating appliances had been connected with the dynamo and Norman at times even complained of the heat. After the first hour of flight, both boys began looking for the flare of the gas well. When this at last came in sight, the car was headed directly for it. At that time both boys agreed that the river beneath was covered with ice from shore to shore.

“Anyway,” said Norman, as the gas well came into full view, “looks as if Paul didn’t succeed in capping the gusher to-day.”

To warn their friends of their arrival, the boys threw on their searchlight, and the arrival back of the aerodrome was unmarked, except by the vociferous welcome accorded by the alarmed occupants of the camp.

Another supper was awaiting the relief expedition and for some time all were busy with the cause of the delay and the details of the condition of the Indian encampment. Unquestionably there would have to be another visit to the camp to ascertain at least the result of the hunting expedition.

Strangely enough, before the matter of Chandler’s letter was reached, the discussion reached the work on the gas well that day. When Roy suddenly recalled the episode of the discovery in the paralyzed Indian’s cabin he started to produce the letter, but hesitated because both Ewen and Miller were present. In his discussion with Norman on the way back, it had been decided that the letter had probably been written by one or the other of these men and that its appearance might cause embarrassment. Both Ewen and Miller had been very curious about the settlement at Pointe aux Tremble, but they had asked no questions that connected Chandler with the place.

When the hour grew late and Colonel Howell proposed retiring to the bunk room where the iron stove was red hot, since neither Ewen nor Miller gave signs of turning in, Roy put off the matter of the letter until later. When the three boys sought their bunks, Ewen and Miller still lingered in the big room, and Colonel Howell was asleep.

“Time enough in the morning,” suggested Norman.

In the morning, however, Colonel Howell and Paul with Ewen and Miller were up and at work before Norman and Roy were astir. The weather had not moderated but Colonel Howell was anxious to bring the work on the gusher to a close. Ewen and Miller attacked the frost hardened ground before breakfast and this work had now reached the point where Paul could help in removing the heavy clods.

When the young aviators joined their friends at breakfast, Ewen and Miller were present again and the letter was not exhibited. Then all hurried out to complete the work of attempting to control the gusher. The regulator and the ordinary apparatus to connect it with the mouth of the pipe, together with the smaller tubes and their valves that were to be attached above the regulator, were all in place. In the end, Colonel Howell proposed, with still smaller pipes, to lead part of the gas into the fireplace and the bunk house stove.