136 



THE ROYAL SOCIETY OF CANADA 



Table IV — Relation between the Advance of the Ripple and Velocity of 



Moving Surface for Salt Solutions of Varying Specific Gravities 



AND FOR Water 



In order to learn whether the diameter of the tube played any 

 part in the phenomenon, two smaller tubes of diameters -8 and 1-2 

 cm. were placed within a large tube and it was observed when the 

 water was allowed to ascend that there were five ripples, three being 

 within the tubes and one on the outside of each of the smaller ones. 

 Considering only the ripples on the inner surfaces, the advances were 

 in the order of their diameters. Considering one small tube the ad- 

 vance of the outside ripple was greater than that of the inside one 

 when the liquid was near the bottom of the tube but as it neared the 

 top, the inside ripple overtook and passed the outside one. This 

 operation was repeated with strong salt solution. All the ripples had 

 the same advance. The two inner tubes were now replaced by a single 

 tube and a narrow strip of plane glass and the experiment again re- 

 peated with water and with the salt solution. There was a ripple on 



