Dr. Wright and Messrs. Thompson and Leon. [Feb. 

 FIG. 8. 





In order, if possible, to obtain experimental evidence of the truth 

 or otherwise of the general proposition arrived at by Sir G. G. Stokes, 

 as well as some explanation of the deviation therefrom of these 

 previous results, we first of all carried out various further experi- 

 ments with mixtures of lead, zinc, and tin, employing additional 

 precautions to minimise errors due to imperfect intermixture, more 

 especially by continuing for much longer periods of time the process 

 of agitation of the fused metals by vigorous stirring; the results, 

 however, did not differ materially from the previous ones, and 

 indicated generally that the composition of the heavier alloj 

 practically obtained associated with a given lighter one, or vice vend, 

 was subject to fluctuation within certain not very wide limits, 

 according to the proportion subsisting between lead and zinc in the 

 original mixture employed; but whether this result was brought 

 about by interfering causes, or was possibly due to the not absolute 

 correctness of Sir G. G. Stokes 's principle, the experiments did not 

 unable us to decide. In the hope of eliminating disturbing causes, 

 we next endeavoured to carry out analogous observations at the 

 ordinary temperature with liquids not metallic in their nature, bat 

 resembling the metals tin, lead, and zinc from the point of view of 



