Abstract
1. Climatic conditions in Michigan sand dunes are sufficiently variable to produce marked effects in the annual growth of Thuja occidentalis. 2. A graph showing the annual growth of each of a group of trees indicates the period of existence of the dead trees. 3. The time required for the destruction of this particular area was approximately 160 years. 4. The active sand dune in this region averaged 3.12 feet per year in its progression into the living forest. About 20 years is required for the life of a tree to be terminated by sand moving at this rate. 5. The destruction of living forests by the moving sand in this dune region occurs very slowly, as revealed by the records of the annual growth of Thuja occidentalis.
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