Eight lectures on the signs of life from their electrical aspect eightlectureson00wall Year: 1903 IV.] THREE TYPES OF RESPONSE 63 ingoing, and I may add, to complete the account, that it may also be 'mixed'—negative then positive, or positive then nega- tive, or positive negative positive.* And now that you have witnessed a representative experi- ment, I will project on the screen the records of some previous experiments. voLt ooi becand.

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