98 On the Existence of a Compound of Gold and Tin. 



This alloy was remarkably brittle, so brittle that I could 

 only prepare it in short pieces. On testing the E.M.F. of 

 small pieces of this alloy thev behaved in a curious way, some of 

 them giving the E.M.F. 1 : 2 volt, others the E.M.F. -95 volt, 



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and others intermediate numbers. Fresh sand-papering the 

 surface also affected the results. This behaviour is just what 

 might be expected to happen on testing an alloy containing a 

 very small excess of free tin scattered through the compound 

 and sometimes absent altogether, and sometimes eaten from the 

 surface by local action. Evidently, then, the compound had 

 just been passed over. On now comparing these results with 



