SURFACES OF DISCONTINUITY 



519 



situated at P; we realize at once that the layer of liquid near 

 the surface which has no resultant effect on the molecule is not 

 bounded by a plane surface through B but by a concave one 

 having the same curvature as the surface of the liquid mass. 

 The net result of this will be that the inward attraction on the 



B 



C 



Fig. 1 



c 



Fig. 2 



molecule will be greater than for a similar situation beneath a 

 plane surface, since in the latter case we determine the effect of 

 the molecules under the plane surface DBE (see Figure 2), 

 whereas in the former we include the effect of the molecules 

 between the surfaces DBE and FBG as well When the analysis 



