Field Operations of the Department of Terrestrial Magnetism, Carnegie Institution of Washington, for the year i926-27 . For the year closing June 30, I927, the land-survey work was limited to what a single observer in Africa could do in addition to the utilization of opportunities afforded by co6perating organizations. About July I, 1926, was finished the campaign of taking observations again in a series of repeat-stations in the western continent south of the United States. By this means data were secured on secular and diurnal variation of the magnetic elements. A similar resurvey was undertaken for Africa. Here the conditions of travel have improved since the Department began its work in 19o8, yet delays are still frequent and speeds are small. " By the end of June I927 repeat stations had been reoccupied along the coast of western Africa from Morocco to the mouth of the Congo River, and along such routes to the interior as were available. Among the latter may be mentioned the Senegal River, the Niger River from its source through French Soudan to Cotonou in Dahomey, the Benue River from Garoua in Cameroun to its junction with the Niger River, across northern Nigeria from Kano to Fort Lamy on Lake Tchad, and through French Equatorial Africa and Belgian Congo from Fort Lamy to Boma." Mr. J. E. Sanders, the observer, must have passed an interesting year with his attention directed at one time to the getting of observations at a place on the magnetic equator when the sun passed near the zenith and at another to the unfavorable weather conditions on the Ivory Coast or to his dwindling stock of supplies.
G. F. S.