62 THE COMPRESSIBILITIES OF THE MORE IMPORTANT 



Data concerning the compressibilities of twenty-one metals. Continued. 



1 The first sample of paraffin oil was used here. In all the other experiments except Nos. S, 9, and 29 water 

 was used. 



2 The less compressible paraffin oil was used in this case. See p. 59- 



It will be noticed that in some cases the determinations have been made 

 in duplicate, either because of the experimental opportunity presented by 

 the temporary possession of large quantities of pure rare metals or because 

 of doubt concerning one of the determinations. In most cases this dupli- 

 cation was not considered necessary, because the method employed of 

 adding successive amounts of mercury and then taking out most of that 

 which had been added (in order to determine if the system had altered 

 during the compression) practically amounted to a multiple reduplication 

 of the work. Any inaccuracy in any of the readings would have been 

 detected at once from the form of the curve. Thus it may be said that 



