190 



W. CrooTces— Position of Helium^ Argon and 



The accompanying figure, photographed from the solid 

 model, illustrates the proposed arrangement. The dements 

 falling one under the other along each of the vertical ordi- 



nates, are 



II lie 



CI Ar 



Br Kr 



I — 



( ) - 



<) 



Li Gl B C 



K Ca Sc Ti 



Rb Sr Yt Zr 



Cs Ba La Ce ( ) ( ) 



()()()() Ta W 

 _ — — Th 



Na Mg Al Si P 



N 



V Cr MivFe-NiCo Cu Zn Ga Go As Se 



Nb Mo RhRu-Pd Ag Cd In Sn Sb Te 



( ) ( ) 



IrPt-Os Au 



()()()()() 

 Hg Tl Pb Bi 



Ut 



The bracketed spaces between cerium and tantalum arc 

 probably occupied by elements of the didyinium and erbium 

 croups. Their chemical properties are not known with suffi- 

 cient accuracy to enable their positions to be well defined. 

 They all give colored absorption spectra and have atomic 

 weights between these limits. Positions marked by a dash 

 ( ) are waiting for future discoverers to fill up. 



!il»teH^S 





\ >v^=g^ - s ~~" 



Let me suppose that at the birth of the elements, as we now 

 know them, the action of thews generatrix might be diagram- 

 matically represented by a journey to and fro in cycles along 

 a figure-of-eight path, while simultaneously time is flowing on, 

 and some circumstance by which the element-forming cause is 

 conditioned (e. g., temperature) is declining ; (variations which 

 I have endeavored to represent by the downward slope.) I he 

 result of the first cycle may be represented in the diagram by 



