 He had bluish gray eyes and a somewhat sallow complexion, but which inclined to ruddiness upon exercise or from blushing, a habit he was much given to from excessive diffidence.His nose, long and thin, and his forehead, broad and angular, were his most characteristic features.Being an intense student, his mind appeared to be constantly preoccupied, and he seldom spoke to anyone unless he was spoken to, and then his voice was thin and feminine – almost squeaky – while his utterances were quick, jerky, and sententious, but when once made were there ended; there was no repetition or amending; no hypothesis or observation to lead to further observation.