104 



KANSAS ACADEMY OF SCIENCE. 



The rest of the hecdecade is arranged simply according to atomic weight. 

 The valency cuts no figure in the case. They are all represented as trivalent. 

 It is inconceivable that all the elements of a hecdecade except the first two 

 should be trivalent. None of them correspond with the specific gravities 

 opposite to which they are placed. The specific gravity of Davydium (9.39) 

 would show that it belongs, not where it is placed but further down the scale. 

 The other properties, as valence, brittleness, melting point, electrical status, 

 spectral lines, transparency to certain forms of radiant energy, etc., must de- 

 termine its position. The same is true of the other elements. 



(Gold) Hecdecade. 



In all this hecdecade the atomic weights as determined seem to be too low to 

 correspond with the specific gravities. This is especially true of Tungsten and 

 Osmium. 



(Thobium) Hecdecade? 



Not enough is known of this hecdecade to know whether the common differ 

 ence in atomic weights is 3, S^o, or 4; nor whether it is a hecdecade" of two 

 octaves or something else. Whether the limit of chemical elements is reached 

 in this hecdecade, or whether they continue indefinitely to increase in atomic 

 weight and specific gravity as more new elements are discovered; or whether 

 they will all at last be resolved into still simpler forms, remains for the future to 

 tell. 



I here present two graphic charts showing the curves of specific gravity, ar- 

 ranged first by hecdecades, second by groups. 



