Roger Cross records that minute traces of oil and metal particles were found on the third letter and that they were examined through an electron microscope.. Perhaps he never saw the envelope,, it looks like a lot of oil and metalic mess was on that envelope,, like it had been in the bottom of an oily tool box.. Professor Gee examined the girl who was killed a few days later and found traces of oil, metal particles and carborundum in her wounds,, coincidence only goes so far,,!! I often refer to three predictions in the letters and tape,, the first one in Manchester is clear and obvious to anyone who cares to read the letters.. The second prediction is not quite so obvious for it is only a warning of jack is getting back to work but one has to understand that after fulfilling his first prediction it would then be rather foolish for him to be so candid about his second prediction.. He could not say I will kill next time in Halifax and then expect to carry out the promise without putting himself at risk of being spotted or caught.. The Police had surviellance teams operating in Bradford and Leeds waiting for him to strike,, they were a bit of a joke amongst the girls and it is a pretty safe bet that the killer had checked for the presence of surviellance.. The knitpickers try to persuade everyone that the second prediction is inaccurate because he suggested he might go to Bradford and the next girl was killed in Halifax, but their arguments are absurd,,the rules of engagment changed from the moment he killed Vera Millward in Manchester.. It is the timing of this warning of resumed activity that is of particular significance because it came true only twelve days later, after a gap of a year.. That he wrong-footed them by suggesting Bradford does not in any way detract from the validity of the prediction or warning that Jack was back to work again... The circumstances change as the killer proceeds with his game in defiance of their attemps to catch him...
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