FROM 1940 to 1946, staff members of the Illinois Natural History Survey have conducted investigations of the flock of Canada geese wintering at the Horseshoe Lake Game Preserve in Alexander County, Illinois. Between 1943 and 1946 the writer was engaged in this research program. Periodic censuses were made of this flock as it gradually increased in size during the autumn. These censuses as well as trapping activities afforded opportunity to scan the flock carefully for varieties of geese other than the greater Canada goose, Branta canadensis interior Todd, which made up the flock, and to note any unusual plumages. During the latter years of the study a surprising number of individuals showing unusual plumage variations, particularly white spotting, were observed and in some instances trapped. The author appreciates the suggestions made by Dr. A. V. Nalbandov and Dr. Harvey I. Fisher.