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A physician well educated and doing a large business in a country village, was thrown out of his carriage by a collision with a runaway team, and sustained a brain concussion. He was an invalid for a year suffering from general exhaustion and neuralgia, then resumed business as before. Some time later he became possessed with the idea that a merchant who owned the runaway team, had purposely and with design, started them running down the street, with the object of colliding and killing him. The merchant was a warm friend, and had left town on some business a short time before the accident occured, and this delusion was without the slightest basis in reason or fact. This delusion soon grew into a homicidal impulse, and the next year he made two ineffectual efforts to take the life of this merchant. The physician was arrested and bound over to keep