We have created a sensor-sharing protocol that uses cognition to increase performance by choosing protocol parameters based on the current environment and the past relationships between environment and performance. We have constructed a prototype of the protocol, and experimented with it in a four-node outdoor testbed. Our testbed is part of a larger effort, ADROIT, which seeks to create cognitive teams of software-defined radios [1]. 1

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considered that engineers should be grateful Mr. Baterden. to Mr. Savile for the candid way in which he had described the accident at the entrance of the dock; one failure often taught more than many successes. The difficulty found in ascertaining the dividing line between the sand and clay a t the lock showed the necessity for a greater number of accurate borings over the site of such works. He was acquainted with a case where, over a long line of borings in a riverbed , the depth to the rock did not exceed about 10 feet below low water, whereas about 250 feet eastward of this line, where dock-work was then in progress, the boring-tools went down through mud to a depth of 153 feet below low water before they touched rock. In