72 



Geometrical relation of Nuclei 



the remaining third, then that remaining third will be invaginated, 

 if the third and last condition is fulfilled, namely, 



(iii) That the whole circle is sufficiently large ; because the 

 invagination process can be inhibited if the circle is so small that 

 the pressure between the neighbouring balls at the point of contact 



9-7 



-e- 



Fig. 34. Diagram representing a circle of spheres in which the relative position of 

 the centres of attractions (6) to the centres of the mass (17) necessary to cause 

 invagination of one part of the circle within the other part are shown. 



is greater than the attractive force between the attractive centres 

 of ball and ball, (which ex hypothesi are eccentric to the whole 

 mass of the ball over a certain small area of the sphere or arc of 

 the circle,) in this case no invagination will take place. But 

 increase the number of balls and then the invagination may occur. 

 The accompanying diagrams show how this must be so. 



