Pathohistological observations on the soft tissue wounds experimentally produced with steel-bullets of three different weights and 8 different velocities were carried out on 42 dogs. It was found that if the weight of the bullets was identi- cal while their velocities were different, the severity of the injury and the extent of the contusion zone were directly related to the velocity of the bullet. The characteristic feature was that the injury at the entrance of the bullet was more severe than that at the exit. It might be resulted from the fact that the energy of the bullet was rapidly delivered soon after it penetrated the skin because of its light weight and the high resistance of the tissues.
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