"This letter is from your mother, Archie," he said, at length, when he had twice read it through.  "Your father has brought her and the rest of the family to a mission station which has been established for the benefit of the Sercies, on the other side of the Rocky Mountains. Scarcely had they been settled for a few months, and your father had begun to win the confidence of the tribe among whom he had come to labour, than the small-pox broke out in their village, brought by the Blackfeet from the south; and their medicine-men, who had from the first regarded him with jealous eyes, persuaded the people that the scourge had been sent in consequence of their having given a friendly reception to the Christian missionary.  Some few, whose good will he had gained, warned him that his life was in danger, and urged him to make his escape from the district.  Though unwilling himself to leave his post, he had proposed sending your mother and the children away, when he was attacked by a severe illness.  She thus, even had she wished it, could not have left him, and they have remained on at the station, notwithstanding that she fears they may at any time be destroyed by the savages, while the medicine-men have been using all their arts to win over the few Indians who continue faithful.  These have promised to protect them to the best of their power, but how long they will be able to do so is doubtful. Their cattle and horses have been stolen, and they have for some time been short of provisions; thus, even should your father regain his health, they will be unable to travel.  He, like a true missionary of the Gospel, puts his confidence in God, and endeavours, your mother says, ever to wear a cheerful countenance.  She does not actually implore me to come to her assistance, for she knows the length and difficulties of the journey; and she expresses her thankfulness that you are safe on this side of the mountains, but I see clearly that she would be very grateful if I could pay her a visit; and I fear, indeed, unless help reaches your family, that the consequences may be serious.  I have, therefore, made up my mind to set off at once.  We may manage to get across the mountains before the winter sets in, though there is no time to be lost.  I will take Pierre and Corney, with Red Squirrel and a party of our own Indians, and leave Sandy, with Hugh and you, in charge of Clearwater."