Abstract
Microscopic observation was carried out for the sublimation process of snow crystals covered with plastic replica film. It was confirmed that the thermal etch pits were formed on the surface of snow crystals during this process together with the sublimation from the rim of the crystals. The shape of the etch pits is reasonable in view of the crystal axis. The chemical etching of snow crystals was observed by keeping them in kerosene for three months. bservation of the thermal and chemical etching shows that the plane snow crystal developed from one center nucleus is a single crystal.
