Arctic Explorations.—Hayes Expedition. 51 
which tend to change the position of the axis would not be in 
equilibrium with the axis in that position: For the equatorial 
side then would have a motion coinciding in direction with the 
motion of the earth’s rotation, while the other side would have a 
motion the contrary way, and consequently the centrifugal foree 
arising from the motion of the earth’s rotation, combined with 
that of the rotating body, would be greater on the equatorial 
than on the polar side, and give the axis of the rotating body a 
tendency to move in the plane of meridian. It might be easily 
shown, when the axis has a position parallel with the axis of the 
earth, that the forces which tend to change its direction are then 
in equilibrium, and consequently the axis, if free to turn in any 
direction, does not change its position. 
54. These deductions from theory are in exact accordance with 
some very delicate experiments made by Foucault with a pecu- 
liar form of gyroscope, an account of which is given in this 
—— Second Series, vol. xv, p. 263. See also vol. xix, p. 
Art. VI.—Geographical Notices; by D. C. Gruman. No. XV. 
ARCTIC EXPLORATIONS. 
thou, et soe the official re : 
gra iety of New York. Every thing had pi- 
ous up to the time of his writing from Upernavik, an 1 Com- 
r and crew were in excellent spirits in view of their long 
prospective seclusion from the inhabited world. Dr. Hayes still 
adhered to his plan of wintering at Cape Frazer (lat. 79°42’). - 
