1877.] The Rev. S. Haughton on Physical Geology. 55 



Long. 



1 — COS3 X. 



2cosZ(l-cos 3 X). 



o 



45 



1-00 



1-42 



40 



1-00 



1-52 



35 



1-00 



1-64 



30 



1-00 



1-74 



25 



1-00 



1-80 



20 



1-00 



1-88 



15 



1-00 



1-92 



10 



I'UO 



1 yo 



5 



1-00 



1-98 







1-00 



2-00 





Total . 



. . . 17-86 



The displacement of the pole, in miles, produced by this imaginary 

 continent is, by equation (10), 



r$= -14-11 x 17-86 = — 252 miles. 



Xo. II. On the amount of shifting of the Earth's Aceis, already caused by 

 the elevation of the existing Continents. 



Having shown in the preceding note that the motion of the earth's 

 axis caused by the geological wrinkling of the earth's surface depends 

 (in consequence of the weight of the sea- water) only on the continents, 

 it remains for me to calculate the numerical amount of change of axis 

 produced by each of the existing continents. 



For this purpose I select the following meridians for the coordinates 

 T and X of the motion : — 



o 



Greenwich +Y 



Rangoon 90 —X 



Behring's Strait 180 -T 



Yucatan 270 +X 



Reckoning the longitudes eastward, round the whole circumference of the 

 earth, the equation (10) generalized becomes 



r0= -14-11 (cos 3 X'-cos 3 X), (11) 



in which the meridian of each 5° of longitude is used, X'and X being the 

 lowest and highest degrees of latitude of the land on each meridian. 



The expression cos 3 X' — cos 3 X is found by observation on the globe, 

 and resolved into its components X and T, regarding the Xorth Pole 

 as the axis moved. "We thus find 



