Naturally he was of a rather melancholic tendency, prone to dwell on the sadder side of things, and was constantly interested in sad stories and songs. He liked sad music, {353} and usually refused to listen to the livelier airs that others, especially of his race, were apt to find so refreshing. Something of this sterner side of his character entered into all his relations with others, and even with his own family. Though deeply affectionate, he very seldom permitted them to see and appreciate that fact. He was rather apt to be stern than otherwise, fearful lest his affection should in any way spoil them. To the very young children, in whose regard he did not consider this objection to hold, he was almost demonstratively affectionate, and those who knew his love for little children appreciated the sacrifice he made in denying himself demonstrations of affection to his own. With all his sadness there was, as might be expected from his racial descent, a vein of dry humor, not infrequently manifest, though only to very near friends. He appreciated a good story, though the slightest tendency to vulgarity was extremely displeasing to him. He is said to be the originator of the humorous expression that has since been used often enough. While one day calling at a friend's house, in the absence of the friend, the servant asked him to leave his name, but was met with the reply (from the doctor) that "he preferred not to, as he thought he might have use for it before he got home." The religious side of O'Dwyer's character is intensely interesting, because it represents a successful professional man--the maker of an important discovery in medicine; a logical, scientific thinker, whose opinion was valued by all his professional brethren--as one of the simplest of believers, tenderly pious and faithful. The sexton of the church near which he lived tells (since his death) of frequently seeing him steal in during the day to say his prayers at the foot of the altar. He was one of the most faithful attendants at the communions and retreats of the Xavier Alumni Sodality {354} of New York City, of which he was an enthusiastic member. His deep piety can, perhaps, be best appreciated from a characteristic incident, which illustrates his faith in prayer--his confidence in Providence. He had asked for something with regard to one of his children over and over again, and finally thought that his prayer had been heard. Later on he had reason to regret the fact that his wish had been granted, and to a friend, to whom he told the circumstances, he said: "All that we can do is to say with resignation, 'Thy will be done,' and then we shall be sure that whatever happens will be for the best."