318 



Influence of Crystallisation. 



Crystallization influences the expansion of bodies as it does their 

 power to conduct heat ; thus, the same zinc cast horizontally or ver- 

 tically has not only a different crystallized structure, but also expands 

 in a different ratio. 



We have also examined the ratio of expansion in several series of 

 alloys made in multiple and definite proportions, but shall give here 

 only one series as illustrating our results. 



Copper and Tin. 



