220 INTEGRAL ATOMIC WEIGHTS DODD. 



elements progresses, the Atomic Multiples either remain con- 

 stant or rise (with one exception). 



While they remain constant, the melting point curve falls 

 rapidly. Where they materially increase, the melting point 

 rises abruptly. Small increases only just check the fall of the 

 melting point curve or may just give a slight rise, thus forming 

 the double periodicity humps. This is most readily seen by 

 marking the Atomic Multiples on a melting point curve. It 

 will be seen that in the cne instance where the Atomic 

 Multiple falls the melting point drops below zero. 



Specific Heat. 



The Integral Atomic Weight of an element multiplied by 

 the specific heat of the element is a more constant quantity than 

 the ordinary atomic weight of an element multiplied by its 

 specific heat, the departure from a mean being reduced by 

 about 30 per cent. In the lower parts of the scale the reduction 

 of variation is much more than this. 



Conclusions. 



The author thinks there is strong evidence that these 

 suggested Integral Atomic Weights are a real function of 

 their respective elements, and if they be accepted the inferences 

 are: 



(a) That the heavier elements are built up from the 

 lighter elements with probably hydrogen, helium, and 

 possibly lithium laigely as constituents, these sub- 

 atoms being conjoined in some vibratory system 

 which renders a part of their material unnecessary to 

 the structure of the complex atom ; for if the Atomic 

 Multiple, or the Integral Atomic Weight be taken 

 as proportional to the number of ultimate sub-atoms 

 constituting any given atom, then the excess of these 

 magnitudes over the accepted atomic weight may bo 



