Abstract
Two new phenomena are described which would indicate directly two mechanisms of mass transfer along an ice surface. One is the neck formation observed between an ice sphere and a plane placed cose to but not in contact with it in an ice-saturated atmosphere. This indicates that mass transfer through the atmosphere is the major mechanism of sintering. Growth from both the ice sphere and plane were observed. The growth rate is of the same order as the calculation based on the theory of Hobbs and Mason. The other phenomenon is particle migration, without rolling, on a subliming ice surface. Glass beads, shards, clusters, or other particles scattered on a subliming ice surface migrate randomly. This seems to indicate the existence of mass flow in a relatively thick layer. Some possible mechanisms are discussed.
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