i a | 
W. B. Rog ers on Rotating Rings of Air and Liquids. 257 
five inches, it breaks up with a peculiar outward uncoiling 
motion, forming at intervals of the circuit flattened spaces, from 
the outer points of which the pigment is seen dropping in numer- 
ous slender streams. ~ 
12. Motions and structure of the liquid — rotation oe 
, ; 2 
coloring matter, But usually, after reaching a distance of four or 
com- 
lored 
the rings as slowl ay be 
With the colored liquid all the stages 
marked in the case of rings of air. E 
Tather I can cause the esca 
by a yet quicker and stronger imp 
ha *6 nas rapidly away, leaving the 
r to form by its own motion 
