This purpose had hovered before his thoughts in dim outline while he was yet a boy, and had at length assumed its full and clear proportions while he was at Oxford.  There it was that he became acquainted with a Christian young man who, pitying his loneliness and appreciating his character, had sought and by degrees obtained his friendship, and, in a measure, his confidence, as far as he was able to give it.  To his surprise Amos discovered that his new friend's father was the physician under whose charge and in whose house his own mother, Mrs Huntingdon, had been placed.  Mr Huntingdon had kept the matter a profound secret from his own children, and no member of his household ever ventured to allude to the poor lady or to her place of retirement, and it was only by an inadvertence on his young friend's part that Amos became aware of his mother's present abode.  But this knowledge, after the first excitement of surprise had passed away, only strengthened the purpose which had gradually taken its settled hold upon his heart.  It was to him a new and important link in the chain of events which would lead, he knew, finally to the accomplishment of his one great resolve.  And so he determined to communicate with his friend's father, the physician, and ascertain from him in confidence his opinion of his mother's mental condition, and whether there was any possibility of her restoration to sanity.  The reply to his inquiries was that his mother's case was far from hopeless; and with this he was satisfied.  Then he took the letter which conveyed the opinion of the physician to him, and, spreading it out before God in his chamber, solemnly and earnestly dedicated himself to the work of restoration, asking guidance and strength from on high.