Abstract
This is continuance from previous papers by the authorl), 2). Fig. 3 shows the horizontal distribution of snow crystals during the snowfall on January 25, 1961. Photomicrographs of plastic replicas of these crystals are shown in Photos. 1-4. Characteristic of this snowfall was that the snow crystals fell from two cloud-layers ; that is, plate, stellar and column crystals fell from the upper layer, and needle crystals fell from the lower one. As seen in Photos. 5-7, the plate and column crystals from the upper layer developed along the c-axis during their drifting in the lower layer suitable for needle evelopment.
