276 



NATURE 



jyuly 21, 188 1 



Some such proportionality, consequently that for a series of 

 atoms their volumes might be expressed by the terms — 



I IT 7^ : i TT w! 7' ; ^ IT K 7^, &c., &c. , 

 and therefore stand, one to the other, as ihe.'ucce.sion of terms — 



ir ; nm ; im, &c., &c., 

 that i'', be related by a series of terjiis in function of tt. 



It may be remarked that this would still be admissible if it be 

 a'sumed that the forms of the atoms he that of vortex rings as 

 argued in the very remarkable article by Mr. Tolver Preston 

 referred to. 



But if such a relation be allowed to exist it is also legitimate 

 to admit a series of which -J jr, or | it, or ir would be the ratio ur 



