Using a newly developed technique of specific solvents we succeeded in measuring the rare gas contents of the main mineral fractions of stone meteorites separately. In this way we studied the diffusion loss of the radiogenic and spallogenic rare gases in 5 chondrites which all had U-Th-He ages considerably below 4.5 billion years. The results showed that in 4 of these meteorites, which all belong to the UREY—CRAIG group L, no diffusion losses occurred during the time of cosmic ray exposure. Only in one of the meteorites, i. e. Breitscheid, (group H) large diffusion losses of the cosmic ray produced
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