on the Hypothesis of the Earth'' s Solidity. 



331 



log in 

 log (l + 7 ) 

 log cos I 



log 



in 



= 2.-5562965, 

 =0-5124109, 

 = 9-9625322, 



-3 + 4362104 

 ~ -4674500' 



3-7323937 



logg[60x60]- 4 . 1998437 > 



, w 2-4675489 , KW , QQQ 



l0 - Pl = l-7322948 =1 °g 53 988 ^ 



or P 1 = 54 // nearly, P 1 -P = 3"'617. 



Consequently, instead of admitting Mr. Hopkins's result of 

 1" for the difference between the precession of a homogeneous 

 spheroid with the Earth's ellipticity and the precession actu- 

 ally observed, we may affirm that this difference is probably 

 not more than 4" or 5". 



With the best values for the numerical elements the dif- 

 ference is, however, too well ascertained to be overlooked, and 

 it leads to the conclusion that the Earth cannot consist of an 

 entirely solid mass composed of equielliptic strata, and that 

 it is therefore partly composed of a solid shell bounded by 

 surfaces such as I have elsewhere indicated, with an interior 

 mass of viscid liquid, such as is seen flowing from the volcanic 

 openings of the shell, arranged in strata conforming to the 

 laws of hydrostatics, or, in other words, with strata of equal 

 density decreasing in ellipticity towards the Earth's centre. 



Note. — The section shown in the engraving at p. 245 of 

 the paper in the Number for September should be placed 

 thus, with the longer axis parallel to the lines of the page. 



Erratum in same Paper. 

 Line 16 from top of p. 247, far 



— \p(x 2 -\-y 2 )dxdydz read -yif+y^dxdydz. 



Z2 



