In the third place it is urged that the defendant is liable as for negligence. It is said that he owes a duty to the plaintiff to take care to avoid doing acts in relation to her which might damage her personal safety unless there was some lawful justification or excuse for doing those acts. In Hambrook v. Stokes Bros.[9] it was held by a majority in the Court of Appeal that, where the negligence of the defendant in the management of a motor lorry caused a mother to become so alarmed for the safety of her children that she suffered a nervous shock which brought about her death, the defendant was liable in an action under the Fatal Accidents Act. In this case the Court of Appeal rejected the statement of Kennedy J. in Dulieu v. White & Sons[10] that a nervous shock occasioned by negligence and producing physical injury gave rise to a cause of action only where the shock was caused by a reasonable fear of immediate personal injury to oneself. The Court of Appeal accepted the principle that a nervous shock caused by negligence and producing physical injury does give rise to a cause of action even though the injury did not arise from fear of personal injury to the person suffering the shock but from fear by that person of personal injury to her child. There is, however, no negligence apart from the existence of a duty to take care. In Hambrook v. Stokes Bros.[11] the duty to take care was clear. It was obvious negligence to leave an unattended motor lorry, with the engine running, on a public road, at the top of a steep hill, without taking proper precautions to prevent it from moving. In the present case it is difficult to define the duty upon the breach of which the plaintiff must rely in order to succeed in an action for negligence. It cannot be said that there is a simple absolute legal duty to avoid frightening people, or even to avoid causing injury to them by frightening them (See Wilkinson v. Downton[12] and Janvier v. Sweeney[13]). Where there is any duty to take care, the duty is to take reasonable care in all the circumstances of the case, and, in defining the extent of the duty, it is necessary to consider what results may reasonably be expected to follow from the act in question in a particular case. It has been held, in a much-discussed case, that, when the breach of duty is established, the defendant is liable for the results which in fact flowed from it even though they might not have been expected (In re Polemis and Furness, Withy & Co. Ltd.[14]). But the question whether a particular injury could reasonably have been expected is very relevant in the decision of the question whether an act is or is not negligent (In re Polemis and Furness, Withy & Co. Ltd.[15]).