BRIDGMAN. — ACTION OF MERCURY ON STEEL. 341 



direction in which the pores are most distended. It was shown in 

 detail that in all cases in which rupture occurs the strain is of such a 

 type as to distend the metal, and that on the other iiand in all those 

 cases in which amalgamation is not produced by pressure, the strain is 

 such as to compress the metal, closing up the pores. 



This work was done in the course of an experiment on the thermal 

 properties of mercury and water under high pressure, the expenses of 

 which were partially defrayed by a liberal appropriation from the llum- 

 ford Fund of the American Academy of Arts and Sciences. 



Jefferson Physical Laboratory, Harvard 

 University, Cambridge, Mass. 

 October, 1910. 



