As he spoke I noticed, what had often struck me before in his conversations with my grandmother's sisters, that whenever he spoke of serious matters, whenever he used an expression which seemed to imply a definite opinion upon some important subject, he would take care to isolate, to sterilise it by using a special intonation, mechanical and ironic, as though he had put the phrase or word between inverted commas, and was anxious to disclaim any personal responsibility for it;