bration gave y = 1.21 and Ts = 3.7%.Although some space on the photoplate is required for recording the germanium exposures, it is compensated by the provision of suitable plate calibration data, irrespective of the composition of the sample. A possible disadvantage is that, using Ge2+, the y and T6 values obtained specify the calibration over a narrow region of the mass range. However, in practice, it is rarely possible to obtain adequate calibration data over the entire mass range using internal elements. The inconvenience of having to include separate germanium exposures on each plate is partly overcome by first recording, in turn, the exposures on each photoplate located in the plate storage chamber. When a sample is run, the plate has already recorded on it the required calibration data. No memory effects for Ge occur.Registry No. Ge2+,

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