[278] I now recur to the question, What likeness could there have been between an omission and a trespass sufficient to warrant a writ of trespass on the case? In order to find an answer it is essential to notice that in all the earlier cases the omission occurred in the course of dealing with the plaintiff's person or property, and occasioned damage to the one or the other. In view of this fact, Thorpe's reference to indictments for killing a patient by want of care, and the later distinction between neglect before and after the task is commenced, are most pregnant. The former becomes still more suggestive when it is remembered that this is the first argument or analogy to be found upon the subject. The meaning of that analogy is plain. Although a man has a perfect right to stand by and see his neighbor's property destroyed, or, for the matter of that, to watch his neighbor perish for want of his help, yet if he once intermeddles he has no longer the same freedom. He cannot withdraw at will. To give a more specific example, if a surgeon from benevolence cuts the umbilical cord of a newly-born child, he cannot stop there and watch the patient bleed to death. It would be murder wilfully to allow death to come to pass in that way, as much as if the intention had been entertained at the time of cutting the cord. It would not matter whether the wickedness began with the act, or with the subsequent omission. The same reasoning applies to civil liability. A carpenter need not go to work upon another man's house at all, but if he accepts the other's confidence and intermeddles, he cannot stop at will and leave the roof open to the weather. So in the case of the farrier, when he had taken charge of the horse, he could not stop at the critical moment [279] and leave the consequences to fortune. So, still more clearly, when the ferryman undertook to carry a horse across the Humber, although the water drowned the horse, his remote acts of overloading his boat and pushing it into the stream in that condition occasioned the loss, and he was answerable for it. In the foregoing cases the duty was independent of contract, or at least was so regarded by the judges who decided them, and stood on the general rules applied to human conduct even by the criminal law. The immediate occasion of the damage complained of may have been a mere omission letting in the operation of natural forces. But if you connect it, as it was connected in fact, with the previous dealings, you have a course of action and conduct which, taken as a whole, has caused or occasioned the harm.