i of Metallic Alloys, 6^c. 297 



amalgam of one atom of tin to three of mercury the contraction 

 is nearly as great as in the amalgam of one atom of tin and one 

 atom of mercury. Hence it was probable that between the pro- 

 portion of one atom of tin to two atoms of mercury, and one 

 atom of tin to three atoms of mercury, there would be found an 

 amalgam in which the contraction is nothing. He found, in- 

 deed, that ti7i and lead may be combined in such a proportion 

 that the alloy has neither contraction nor dilatation of bulk, 

 and that when this happens the proportions of their elements 

 are to their specific gravities in a very simple ratio. 



I. Alloys of Tin and Lead. 

 The following are some of the results : — 



Tin, 



Hence it appears that there will be an alloy between tin 2 and 

 lead 1, and tin 3 and lead 1, where the dilatation should be no- 

 thing. M. K. then took an alloy of one volume of lead to two 

 volumes of tin, and found the specific gravity to be 8.6371, 

 while the calculated specific gravity is 8.6375. 



II. Amalgams of Tin and Mercury. 

 The following experiments were made on the amalgams of tin 

 and mercury. 



Specific Grav. 

 Atoms. Atoms. Obs. Calc. Ratio. 



Tin, 3 Mercury, 1 8.8218 8.7635 1.006632 



— 2 1 9.3185 9.2658 1.005685 



— 1 1 10.3447 10.2946 1.004865 



— 1 2 11.3816 11.348a 1.002960 



