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While this never made a brilliant appearance, it gave rise to a greater variety of speculative theories than any previous phenomenon of the kind. See if they are separated at more regular intervals. The change in position of the load-stretch curve is not directly proportional to the time of heating, and it therefore follows that it is also not directly proportional to the coefficient. The more simple spirits who were with me derided them, which greatly surprised me. Remember that only the hard paste products are genuine. The result in each case was a corresponding change of colour in the larvae, confirming the experiments on different individuals of the same batch of larvae which had been supplied with different food-plants or exposed to a different coloured light.