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A study has been made of the photoproduction of /i pairs from carbon using a 5-BeV bremsstrahlung beam at the Cambridge Electron Accelerator. We report here the initial experimental results which when compared with theory 1 ' 2 provide a test of the validity of the quantum electrodynamic (QED) description of the muon propagator at squared four-momentum transfers q m 2 up to about 8 F" 2 . The /i-pair detector was a 154-counter hodoscope arranged in two similar arrays placed symmetrically on either side of the y beam, as shown in Fig. 1. The counters nearest the target defined the polar and azimuthal angles of each member of the muon pair. The range of polar angles 9 covered was from about 4. 5° to about 11.5° and was divided into nine equal intervals. The range of azimuthal angles, cp x and

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