Integral Atomic Weights, Part 2. — By Frank 

 William Dodd, Assoc. Mem. I. C. E., Weymouth, 

 England. 



(Revised August, 1914.) 



Since reading the short paper on this subject in November, 

 1912, at a meeting of the Nova Scotian Institute of Science, 

 the author has given further consideration to the subject, 

 and has also received and considered numerous criticisms. 



The most important of these criticisms and one which, 

 being fairly obvious, was advanced from several quarters, 

 was based on the fact that the specific gravity of an element 

 is not a definite and inherent quantity, but is dependent upon 

 temperature and other conditions, physical and mechanical, 

 and may vary widely for the same element. 



The author's first paper may be summarized in a sentence. 

 It suggested that if the specific gravity of the elements of a 

 group multiplied by a suitable factor be added to the atomic 

 weights of those elements, a series of numbers is obtained 

 which very strongly suggests a system of Integral Atomic 

 Weights, and the building up of the heavier elements from 

 the lighter. 



The question arises, — which specific gravity, seeing that 

 an element may have a great range of specific gravity? 



In the present paper I have to suggest that each element 

 has what may be termed a Natural Specific Gravity, any 

 departure from which may be regarded as more or less ac- 

 cidental. This Natural Specific Gravity results from the 

 combination of certain volumes in a definite manner, anal- 

 agous to the mode of combination of gases; producing a re- 

 sultant compound with a specific volume having a definite 



Proc. & Thans. N. S. Inst. Sci., Vol. XIII. Trans. 15 



(223) 



