60 Fiske and Collins — Surface Travel on Electrolytes. 



The points on the curves for the wires are indicated by crosses, 

 those on the curves for the solution by circles. Each set of 

 curves was made from a series of continuous observations, 

 since, as may be seen at once by comparing the sets, isolated 

 observations are evidently useless. The observations shown in 

 Plate I were taken May 'l 9, those for Plate II on May 21, and 

 those for Plates III and IV on May 31. 



Plates I and II show an apparent inconsistency, the curve 

 for the solution being above that for the wires in Plate I and 

 below it in Plate II. .Naturally the curve in Plate I which 

 contains only two points, is less reliable than that in Plate II, 

 which contains six. The fact that in the observations for Plate 

 I the photographs for the wires were all taken first, while in 

 those for Plate II the photographs for the solution were all 

 taken first, may have something to do with this inconsistency. 

 In the case of Plates III and IV the observations were taken 

 thus : first, two photographs for the solution, then two for the 

 wires and so on. 



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