Mttltiple Proportions of the Atomic Weights. 79 



them is excluded from the system ; as instanced in Co Ni, 

 Ce La, Di Mo, Rh Ru, Pt Ir ; (3) no places are left in the 

 table for the recently discovered elements scandium = 44 

 between Ca Cr— gallium — 69 between Zn In —germanium 

 = 72 between In As ; (4) the differences between the atomic 

 weights of consecutive elements on horizontal lines are in 

 many places more or less than 7 ; as instanced in Y Ce, 

 Cs Tl, Ba Pb where the difference is 9 ; Ta Th 10 ; Cr Y, 

 W Hg 5 ; Au Os 2. 



Bearing in mind the effect of inserting one or two new 

 elements x in the ideal series A, and the discrepancies 

 shown above in Newlands' table, there is abundant evidence 

 to prove that, if the seriatim order of the atomic weights is 

 rightly adhered to, the idea of octaves of recurrent pro- 

 perties has absolutely no foundation in nature. 



The arrangement of the elements in Mendeleeff 's table 

 agrees in many respects with that of Newlands ; but the 

 line of analogous elements being vertical in the former table, 

 and horizontal in the latter, the resemblance is not so easily 

 seen as it would be if the direction of like series were the 

 same in both tables. 



On comparing the first and second vertical series of 

 Newlands with the similar horizontal series of Mendeleeff, 

 it will be observed that in the latter, hydrogen has been 

 moved up one step, and, consequently, excluded from the 

 system. The effect of this transposition of hydrogen has 

 made the greatest difference possible in the two tables ; for 

 whereas F and CI follow H at one end of the series of New- 

 lands, these elements are at the other end of the series of 

 Mendeleeff, as demonstrated in the ideal tables A. B. As 

 the two series in both tables of these chemists are in seriatim 

 order of their atomic weights, and the exclusion of hydrogen 

 from Mendeleeff's arrangement is purely arbitrary, there is 

 no reason for admitting that the positions of the halogens 

 and oxygen series are correct in either table. 



