At the wish of Prof. E. L. Mark, Director of the Bermuda Biological Station, the writer spent the three weeks from March 27 to April 17, 1905, in Bermuda for the purpose of making first, a general investigation of the distribution of the magnetic declination in the Islands, and second, a determination of the latitude at some station. Climatic conditions at that time of the year were very favorable for completion of the necessary work in a short space of time. Thanks are due to Mr. Goodwin Gosling, of Bermuda, for providing a horse and buggy and also charts of the Islands. Most of the instruments were the property of the writer.