As regards physical conditions, the only one that is considered by Mr. Mahaffy as being absolutely essential to a good conversationalist, is the possession of a musical voice. Some learned writers have been of opinion that a slight stammer often gives peculiar zest to conversation, but Mr. Mahaffy rejects this view and is extremely severe on every eccentricity from a native brogue to an artificial catchword. With his remarks on the latter point, the meaningless repetition of phrases, we entirely agree. Nothing can be more irritating than the scientific person who is always saying ‘_Exactly so_,’ or the commonplace person who ends every sentence with ‘_Don’t you know_?’ or the pseudo-artistic person who murmurs ‘_Charming_, _charming_,’ on the smallest-provocation. It is, however, with the mental and moral qualifications for conversation that Mr. Mahaffy specially deals. Knowledge he, naturally, regards as an absolute essential, for, as he most justly observes, ‘an ignorant man is seldom agreeable, except as a butt.’ Upon the other hand, strict accuracy should be avoided. ‘Even a consummate liar,’ says Mr. Mahaffy, is a better ingredient in a company than ‘the scrupulously truthful man, who weighs every statement, questions every fact, and corrects every inaccuracy.’ The liar at any rate recognizes that recreation, not instruction, is the aim of conversation, and is a far more civilized being than the blockhead who loudly expresses his disbelief in a story which is told simply for the amusement of the company. Mr. Mahaffy, however, makes an exception in favour of the eminent specialist and tells us that intelligent questions addressed to an astronomer, or a pure mathematician, will elicit many curious facts which will pleasantly beguile the time. Here, in the interest of Society, we feel bound to enter a formal protest. Nobody, even in the provinces, should ever be allowed to ask an intelligent question about pure mathematics across a dinner-table. A question of this kind is quite as bad as inquiring suddenly about the state of a man’s soul, a sort of _coup_ which, as Mr. Mahaffy remarks elsewhere, ‘many pious people have actually thought a decent introduction to a conversation.’