806 
MR. G. H. DARWIN ON THE SECULAR CHANGES IN 
From (233-4) 
By (121) and (112) 
Therefore 
tC _ r 0 n 
Ti~ 2g f 6 
(237) 
t/_l tin 6 rff 
b n dt % dt 
And 
(l dftl 
\Jc dtjn 
1 +(;)+ 6m } 
(238) 
iy=- 
/1 dg\/rt\ f 
~dt)^dj\ 
(239) 
From (231) and (238) 
+"’!■. (210) 
By (121) and (112) 
o i Ac T ' 
p —b =—=—n 
n 2g 
i^ = a§A( 1 + /w' 
H 2g dt \k dt /2g\ T \r, 
= _(imdJ\d-)( l+ dY\ . (24I) 
\Jc dt/\n~)\ t y\ \r/ y v ’ 
Therefore 
. (242) 
Lastly 
^=w( 1 +?).< 243 > 
By (174), (227), and (230), when the viscosity is not small, we have 
