ABSTRACT. The stable isotop es oxygen-18 and deuterium in snow samples collected in four mountain regions (the South American Andes, the Central Asian Hindu Kush, the Himalaya, and Mounts K enya and Kilima njaro in Africa) have been measured. The altitude effect in fresh snow precipitation and in the snow-pack was d etermined for 15' 8 0 as being within th e range -0.6%0 to about -1.0%0 per 100 m of elevation, but this can be altered or even inverted by secondary fa ctors. These factors are connected with conditions of snow-fall and post-depositional changes in the snow, which are strongly dependent on the topography of the sampled mountain slope and on climatic conditions. All these effects are discussed.RESU~U£
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