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of similar ammunition fired in a particular type, caliber, and make of firearm.' The other group may be termed "accidental," and considered as "individual" characteristics which are peculiar to bullets fired from a particular weapon. Although in the final analysis the identification of a bullet as having been fired from a certain weapon depends principally upon a consideration of "accidental" characteristics, the "class" characteristics are of importance, and particularly so in the preliminary examination. The practical difficulties encountered in the accurate measurement of certain "class" characteristics have already been referred to by Goddard,2 Souder,3 Kraft,4 Mezger, Heess, and Hasslacher,5 Wiard,6 Burrard,7 Hatcher,8 and Gunther.9 To the end of eliminat-

Two New Instruments for the Measurement of "Class" Characteristics of Fired Bullets