AMERICAN 
JOURNAL OF SCIENCE AND ARTS, 
[THIRD SERIES] 
ArT. XV.—On the possible Variability of the Earth's Axial Rota- 
tion, as investigated by Mr. Glasenapp ; by Suwon NEWcoMB. 
h 
forces would be likely to produce either regular inequalities of 
short period, or progressive secular variations, instead of the 
very slow and irregular changes actually observed. If, then, 
the first hypothesis were excluded, we should have to fall back 
on the third as the most probable explanation. 
The investigation of the first hypothesis is a purely mathe- 
matical process, admitting in theory of being carried through 
with any degree of rigor. Since the publication of the paper in 
question I have been engaged in this investigation, and although 
the pressure of other engagements has prevented its completion, 
it is so far advanced as to make it quite improbable that there 
are any other inequalities of long period in the motion of the: 
Am. Jour. Sct.—Turrp Sertes, Vou. VIII, No. 45.—Sept., 1874. 
il 
