A history of the fluctuations of the Nisqually Glacier on the southern slope of Mt. Rainier, Washington, including the period of increased glacial activity during the last ten years, indicates that a number of minor advances have occurred since the maximum extension of the ice about 1750. These new data on glacial activity in the United States of America should be useful in examining the idea of synchronism in glacial behavior in different regions of the world. In addition, photographs of the changes in the Nisqually Glacier during the last four years indicate the magnitude of the recent increase in glacial activity in this country.