He might have added laughter to the list if only the means of exciting it in men of intelligence were as ready to hand, and the wit or originality of humour which it requires were not just as rare as the talent is common for inventing stuff that breaks one's head, as mystic speculators do, or that breaks one's neck, as the genius does, or that breaks one's heart as sentimental novelists do (and moralists of the same type for that matter).