546 



EXPEDITION TO POINT BARROW, ALASKA. 



Term-day readings of the Brooke balance magnetometer, May 1, 1883. 



Term-day readings of the Brooke balance magnetometer, May 15, 1883. 



Term-day readings of the Brooke balance magnetometer, June 1, l.ss.'i. 



Term-day readings of the Brooke balance magnetometer, June 15, 1883. 



Term-day readings of the Brooke balance magnetometer, July 1, 1883. 



