It seems a plausible suggestion that part of what is required in order that A may be correctly said to have performed some operation (a calculation, the cooking of a meal) carefully is that A should have been receptive to (on alert for) circumstances in which the venture might go astray (fail to reach the desired outcome), and that he should manifest, in such circumstances, a disposition to take steps to maintain the course towards such an outcome. I have heard it maintained by H. L. A. Hart that such a condition as I have sketched is insufficient; that there is a further requirement, namely that the steps taken by the performer should be reasonable, individually and collectively. The support for the addition of the supplementary condition lies in the fact (which I shall not dispute) that if, for example, a man driving down a normal road stops at every house entrance to make sure that no dog is about to issue from it at breakneck speed, we should not naturally describe him as "driving care-fully," nor would we naturally ascribe carefulness to a bank clerk who counted up the notes he was about to hand to a customer fifteen times. The question is, of course, whether the natural reluctance to apply the adverb "carefully" in such circumstances is to be explained by the suggested meaning-restriction, or by something else, such as a feeling that, though "carefully" could be correctly applied, its application would fail to do justice to the mildly spectacular facts.