368 On the Freezing Point of Tin. [June 3, 1889. 
The preceding table gives a summary of the results hitherto 
obtained. Column four gives the lowering of the freezing point 
of tin caused by dissolving one atomic weight of each of the metals 
in 100 atomic weights of tin, and is calculated by proportion from 
the observed numbers. 
The case of aluminium is of special interest, and perhaps points 
to the molecule of this metal being Al,, that is, assuming that zine, 
cadmium and mercury in dilute solution remain monatomic as in 
the gaseous state. We conclude from our experiments : 
(a) That up to the limit of solubility of a metal in tin at the 
observed temperatures the lowering of the freezing point is directly 
proportional to the weight of metal added. 
(8) That this lowering of the freezing point is inversely as the. 
atomic weight of the metal added. 
These laws hold also for the solution of medals in sodium, but 
the atomic fall instead of being about 2”4 is about 4°°5 C. 
