Hall Effect and Specific Resistance of Silver Films, 200 to 20 μμ. Thick.—In agreement with previous results, the specific resistance increased more and more rapidly with decreasing thickness, becoming infinite for about 20 μμ. On the other hand the Hall coefficient was found to be the same in the films as in the bulk metal. The thicknesses were computed from the weight of silver in each film, assuming the density that of the bulk metal. The films were obtained by chemical deposition.