Whether there was any evidence that his walking occasioned the deceased's death when it occurred is to be ascertained by an examination of the evidence of the three medical witnesses that were called. Dr. Duck and Dr. Calov were called for the applicant and were examined on the hypothesis that did not eventuate, namely, that it would be found that the deceased was not only walking but was hurrying or was excited as well. There is nothing in Dr. Calov's evidence that can be regarded as unconnected with this hypothesis, so his evidence must be put on one side. The respondent claims, however, that it is different in the case of Dr. Duck's evidence. The difficulty about his evidence will become apparent upon quoting the last two questions and answers in his examination-inchief: - "Q. Assuming this man was hurrying to catch a train, having regard to the condition of his arteries as found by you, do you think that could have any effect in the death? A. Yes. Q. Would you explain to His Honour the effect it could have? A. In a condition of defective nourishment of the heart wall, the muscle of the heart, death could have occurred at any time but it would be much more likely to occur under stress of excitement or with physical exertion." Taken in the context, I think the only fair way of understanding the last answer is to read it as though the words "if he were hurrying to catch a train" were inserted between the words "but" and "it" so that the last answer is confined to the hypothesis that the deceased was not merely walking but was hurrying. Dr. Duck's evidence does not, however, stop here. In cross-examination, he said (though in relation not to the deceased's walking but to a hypothetical walk of his own past the Taxation Commissioner's office put to him by counsel) that a hurried walk for a hundred yards on level ground would play a significant part in an acute heart failure in the case of a person liable to sudden death because of sclerosed coronary arteries. The deceased was, without doubt, such a person. Furthermore, in re-examination Dr. Duck stated in effect that if such a person were just comfortably at rest, the odds were that he would not, while resting, suffer a fatal heart attack. Dr. Cobley was called by the respondent and his evidence, as a whole, was quite definite that the exertion of the deceased's walking on the morning when he died, was not sufficient to cause acute coronary insufficiency and that the deceased died because his disease had reached a point incompatible with continued existence. However, at one point in his evidence, Dr. Cobley said: - "It appears to me that there are two means by which the heart muscle can be deprived of oxygen and if it is deprived of enough oxygen an infarction will result. The two means are by an actual occlusion of one of the arteries, one of the coronary arteries, by a clot or thrombus and that is a readily understandable mechanism. The other mechanism would be in a diseased artery, with an increased load put on it by exercise and the heart muscle needing more oxygen, the artery not being thick enough to allow enough blood through it, to deliver sufficient oxygen required by the increased work needed to be done by the heart muscle." It is now said, because the deceased did not suffer an occlusion from a clot, it follows that it could be inferred from this evidence that the increased load on his heart that led to his death was due to "exercise," that is, his walking.