( 393 ) 
The integrated form is again zero for the two limits. 
+ d, do 
hy ais Q w (hj) dh, pd 4 ze fn w (4) dh, . . . (2) (1 ) 
. dh dh 
0 
0 
oo u u=n 
fs hy = aby de w(udhj)du=— = 7) fi dh, fy (u+h,) du = 
0 u=0 0 u=0 
uo u= 
e) a) fi dh, fe. re aha) & ) i dh, E (w-+%)| = 
u=0 u=0 
ae er ) fi dh, 77 (hy) = — (2) fr (hy) ad. 
0 
ie ral] — (2) He (a) thy /. @@) 
0 0 
The integrated form is zero for the two limits. 
h do dg A 2 | 
[Ss ae en ON 
0 0 
ae 
u 
do 1 dg d? Yv f 
Ne ne on ~ Spe + hj) udu= — - ; dhy fy nh) u du. (2)(3') 
: th dh lh a 
0 ce "pes 
i 2) 
This expression has the dimension { A? w (hj) dh, and will be 
0 
neglected by us as well as (3) (2') and (8) (3). 
For the molecular pressure in the direction normal to the surface 
of the liquid we find therefore : 
do “hy? 
ag? en om: i wy (h)) dh, + oe mt ae a — (hj) dh, +e fi w (hj) dh, —— 
0 0 0 
-(4) uh do hy? 
er igh Migs Ot to w (hy) dh, 
es dh? 
0 
or 
