80 



PROCEEDINQS OF TH:^ 



[Oct., 1875. 



The above Table is a 

 copy of that now hanging 

 in my lecture-room, wbich 

 is modified in some degree 

 from the one constructed 

 last year. The chief nov- 

 elty in their construction 

 is the inve7'Swnof each half 

 of the well known table of 

 Electro-chemical Series. 

 (Barker's table 11, p. 16,) 

 by which change I bring 

 into 'proximity the ele- 

 ments which He at the ex- 

 tre-mes of the Series, and 

 so, instead of separating 

 those groups which exhibit 

 the highest degree of elec- 

 tro-chemical intensity, and 

 have the strongest affinity 

 for each other, I place 

 them as near as possible. 

 Taking the symbols and 

 atomic weights from table 

 I, p. 14, I write the nega- 

 tive monads, dyads, triads 

 and tetrads, taken from 

 table III, p. 19, in hori- 

 zontal lines in order one 

 above the other, and indi- 

 cate their atomicities or 

 atomic equivalence by — 1, 

 —2,-3 and —4, respect- 

 ively, in the first column 

 on the left ; then, leaving 

 an empty line or gap, 

 marked by index 0, I 

 write the positive monads 

 and dyads below this emp- 

 ty line, successively one 

 below the other, and give 

 them the indices -\-l, and +2, respectively. Among the positive monads I 

 include Ag and Tl, and among the positive dyads, besides Gl, also Zn, Cd and 

 Pb, and among negative tetrads Sn, for which several steps good reasons may 

 be given, and to which probably no serious objection will be made. In each hor- 

 izontal hne the Elements are written in the order of their atomic weights in- 







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 hosphorus 

 ulphur Gr 

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II II 11 II 



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