“1. General principles of the law of negligence.-Negligence is a specific tort and in any given circumstances is the failure to exercise that care which the circumstances demand. What amounts to negligence depends on the facts of each particular case. It may consist in omitting to do something which ought to be done or in doing something which ought to be done either in a different manner or not at all. Where there is no duty to exercise care, negligence in the popular sense has no legal consequence. Where there is a duty to exercise care, reasonable care must be taken to avoid acts or omissions which can be reasonably foreseen to be likely to cause physical injury to persons or property. The degree of care required in the particular case depends on the surrounding circumstances, and may vary according to the amount of the risk to be encountered and to the magnitude of the prospective injury. The duty of care is owed only to those persons who are in the area of foreseeable danger; the fact that the act of the defendant violated his duty of care to a third person does not enable the plaintiff who is also injured by the same act to claim unless he is also within the area of foreseeable danger. The same act or omission may accordingly in some circumstances involve liability as being negligent although in other circumstances it will not do so. The material considerations are the absence of care which is on the part of
