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THE ROYAL SOCIETY OF CANADA 

 Advance of Ripple in cms. 



Time to drain. (Sees.) 

 Figure 5 — Relation between time to drain and the advance of the ripple. 



The first and second set of readings were taken on successive 

 days and there is a chance that a slight alteration in the purity of the 

 water (Toronto water is often chlorinated) is responsible for the 

 change in the position of the curves. 



The following liquids, viz., methylated spirits, kerosene, petrola- 

 tum oil, glycerine, aniline, oil, toluene and soap solution have been 

 tested. No trace of the ripple was found, but, in the case of water 

 diluted with methylated spirits, the ripple began to appear when the 

 water was diluted to 50 per cent, or when the specific gravity of the 

 resulting solution was -93. In the case of vinegar, strong sulphuric 

 acid and strong solutions of sodium and calcium chloride, there was 



