Ch. IV] 



CLEAVAGE OF THE EGG 



45 



arrangement of the six resulting drops to be that shown in 

 Fig. 17, A. We can write out the arrangement in the form 

 of equations: thus (in Fig. 16, B) a = A = B = b; and (in 

 Fig. IT, A) b' = b", a' = a". 



Dividing unequally a and b so that a' is less than a" and V is 

 less than b", the drops arrange themselves as shown in Fig. 

 17, B. A large central cavity is present in the centre of the 

 system. 



If each of the four equal drops (Fig. 16, B) be equally 

 divided, the resulting eight drops arrange themselves as shown 



B 



D E F 



Fig. 17. — Systems of oil-drops. (After Roux.) 



in Fig. 16, C. A central cavity is present, but smaller than 

 when only four equal drops formed the system. 



If we divide each of four equal drops (Fig. 16, B) unequally 

 so that a" is less than a' and b n is less than b', also A" is less 

 than A' and B" is less than B' , the resulting eight drops 

 arrange themselves as shown in Fig. 17, C. The four larger 

 drops come together in the centre, pushing the smaller drops 

 more toward the periphery of the system. 



If we divide four equal drops (Fig. 16, B) so that a" is less 



