1879.] Spontaneous Segmentation of a Liquid Annulus. 53 



3rd Groove. Diameter (d)= 3*17 millims. 

 Principal radius (R) = 22'2 



In this case the quantity of liquid was so great that it was found 

 very difficult to lift the plate without giving it an initial disturbance, 

 which caused some of the drops to run together ; hence it was im- 

 possible to lift the plate as quickly as had been found necessary in the 

 previous cases to secure the maximum number of drops., 



Method of liberation. ~No. of drops. 

 On an iron surface, a plate 

 lifted as quickly as was 

 possible without disturb- 

 ing the liquid 7 



Remarks. 



By computation, some drops 

 having evidently run to- 

 gether. 



6 

 12 

 9 

 8 

 7 

 7 

 8 

 10 

 8 

 8 



By exact computation from 5 

 drops. 



Computed from 5 drops. 



55 55 55 



A certain estimate from 6 drops. 



K 



55 55 ** 55 



A probable estimate from 5 diops. 

 A probable estimate. 



Average. 



8( + ) 



Before discussing these results, I may remark that the number of 

 drops was practically the same, whether on iron or glass, unless, 

 indeed, the iron was very well rubbed with a dry clean cloth between 

 each experiment. When this was done the number of drops was 

 slightly increased. On one occasion 21 were obtained from the first 

 groove. 



In many instances subordinate secondary drops, due to the splitting 

 of the long necks joining the drops before their complete separation, 

 were formed with great regularity ; but sometimes these secondary 

 drops were so large as to be easily mistaken for primary drops. In 

 the case of the third groove, it required practice to lift the plate 

 quickly enough to secure the maximum number of drops. 



