I>R E. H. CRIFFITHS AND MR. KZER GRIFFITHS OX THE 



temperature such as ('., although it is probable that a large majority of 

 are in a stable condition at that temperature. 



It is, however, evident that the curve S* = 4'804xa~"' !l5 yields throughout the 

 whole range of atomic weights values of S (of 2S in the case of gases) which, in the 

 large majority of cases, are within 2 per cent, of the most probable values. 



We prefer to postpone any expression of our views on this matter until we are able 

 to ascertain the results of our experiments at low temperatures. 



The Relation between S and 6. 



The curves given in fig. 8 show that the curvature from C. to 100 C. is far 

 more marked in the case of Fe and Al than in any of the remaining metals, with, 

 perhaps, the exception of Zn at the higher temperatures. If we produce backwards 

 the paralwlas whicli have been found to represent the mean paths over the above 

 range, it is found that the curves of Al and Fe (if they continue of the same character) 

 must cross those of the remaining metals before the temperature falls to absolute 

 zero. 



If we venture to extrapolate, in order to ascertain the values of S given by the 

 respective parabolic equations at -273 C., we obtain the numbers given in column II., 

 Table XXXI. 



TABLE XXXI. 



It appears possible that the values of the specific heats of the last six metals may 

 ontinue to follow the parabolic paths as the temperature falls to -273 C., for an 



1 The expression, atomic heat = 4 804 x <.<><* is obviously an alternative manner of expressing the 

 same relation. 



t In the case of Zn, the equation is deduced from values found from C. to 50-5 C., for reasons 

 given. 



