280 Dr. A, Goldhammer on the Analytical Representation 



In the same way it is easy to see that the portions of the 

 curve DE, EF, FG correspond to : — 



DE + : Fe, Co, Ni, Cu, EF + : Zn, Ga, 



Bu, Rh, Pd, Ag, Cd, In. 



Os, Ly Vt, Au, Hg, TI,' 



- FG-: As' Se' Br, ' 

 _ 8b, Te, I, 



? > y . 



Bi, - , -, 



1 1 5 



whilst the transition elements Ge, Sn, — , Pb fall at the point 

 F. In all these periods the portion of the curve BC remains 

 free from known elements ; but if we compare the portions of 

 the curve AC, EG, which correspond pretty well amongst 

 themselves, and if we observe that the elements corresponding 

 to the portion EF find their analogues (if imperfect) in the 

 elements corresponding to the portion AB (Ca — Zn, Sr— Cd, 

 Sc — Ga, Y — In, &c.) it is easy to draw the following con- 

 clusion : — the elements which may possibly exist between 

 Ti and V, or Zr and Nb, or Ce and Di ought to appear as 

 imperfect analogues of the elements As, Se, Br, Sb, Te, I. 



As to the period Li — CI, which is much smaller than the 

 rest (only 30-32) it is easy to surmise that here also the curve 

 possesses the form ABCDEFG. In fact, Li, Be, evidently 

 correspond to the portion of the curve AB, the transition ele- 

 ments B, C, correspond to the point B, but the next following 

 negative elements N, 0, F, possess exactly the character they 

 ought to have if N, 0, F, are to be represented by the points 

 of the portion BC of the curve ; N, 0, F are imperfect ana- 

 logues of As, Se, Br, &c. Further, we find in the period 

 Li — CI a sufficient place between F and Na for a series of 

 elements which would fall upon the portion CDE of the 

 curve ; these would be analogues of Y, Cr, Mn, Fe, Co, Ni : 

 the newly discovered element argon would perhaps correspond 

 to the point D. 



It is well known that sodium is not a good analogue of 

 Cu, Ag, Au ; this indicates that sodium falls somewhere about 

 the point E, and is thus much nearer to Li, Bb, Cs. We 

 have also, exactly as before, the positive metals Mg, Al for 

 the portion of the curve EF ; for the point F the transition 

 element Si, and finally the negative elements P, S, CI, corre- 

 sponding to the portion of the curve FG. 



For the atomic weights smaller than that of lithium we 

 have only hydrogen and helium ; but since H stands nearer 



