540 



EXPEDITION TO POINT BARROW, ALASKA. 



Term-day readings of the Brooke Mfilar magnetometer, March 15, 1883. 



Term-day readings of the Brooke Mfilar magnetometer, April 1, 1883. 



Term-day readings of the Brooke lifilar magnetometer, April 15, 1883. 



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



