A coincidence circuit for use with anthracene or stilbene scintillation counters is described. Its resolving time lies in the 10−9 sec. range, in agreement with theoretical estimates of the minimum possible resolving time with these scintillation counters. Examples are given of the use of the circuit in the measurement of short gamma-ray half-lives and, in conjunction with beta-ray spectrometers, in the determination of the details of radioactive disintegration schemes. The new results given in these examples are as follows:[Formula: see text]