Abstract
Scattered through the deciduous forests of Indiana there are relic colonies of eastern hemlock, Tsuga canadensis. These colonies, with quite an appreciable group of other species, including herbs and shrubs (1), are generally considered as remnants of a previous southern extension of their natural species ranges. After these species had been forced southward by the conditions accompanying the advancing ice caps, their post glacial movements, in keeping pace with the retreating ice masses back to their original climax ranges, were very irregular. Thus, in the course of post glacial reorganization of the vegetation, hemlock as a species resumed its more northerly range found in the Lake Forest which covers the area immediately north of the Great Lakes.
