1885.] On the Formation of Vortex Rings by Drops. 429 



Fm. 8. 



The observations on which we base these conclusions are the 

 following : — 



We have never seen a ring break up when the liquid forming the 

 ring was the same in all respects as that surrounding it. If the 

 temperature of the drop be different from that of the column, or if so 

 much powder has been added to the drop as to make the difference of 

 the density appreciable, there is breaking up. 



The number and size of rings into which the original ring breaks, 

 and their manner of distribution round its circumference, are quite 

 irregular. 



