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Mr. T. Andrews. 



[June 6, 



The preceding indications of the apparent tendency of the N". pole 

 to become electro-positive in an electrolyte appeared somewhat 

 singular, and after communicating these preliminary results to Professor 

 Gr. Gr. Stokes, and conferring with him thereon, it was decided to make 

 further experiments, and in course of these I have endeavoured to 

 utilise some valuable experimental suggestions which Professor 

 Stokes kindly made. 



Professor Stokes suggested that the results noticed in the first set 

 of experiments with apparatus fig. 6 (see Table E) might probably be 

 accounted for in the following manner, thus : supposing the bars to 

 be equally magnetised permanently, then when the magnet bars were 

 placed in the upright position the magnetism induced in the bars by 

 the earth's magnetic force would in one magnet strengthen, and in 

 the other oppose the permanent magnetism, so that the stronger pole 

 would be the "N. one at the bottom. To investigate this possible 

 aspect of the matter, the apparatus, fig. 7, was constructed with which 



Fig. 7. 



to conduct the further investigations. The arrangement consisted of 

 a wooden stand, W, the thick upper cross-bar of which was hollow 

 and formed a tank sufficiently capacious to hold a suitable quantity of 

 the electrolyte. The ends of two magnetised steel bars were securely 

 inserted from below through the two holes in the bottom, so that the 



