646 Original Articles. [Oct., 
If we consider the analogous elements having a difference of 
about 48 in their respective atomic weights, to stand upon the same 
level, we may represent those with a difference of 44 or 40 as stand- 
ing one or two stages above or below the level, as shown in the next 
table :— 
FA Br 80 ik 17 
Dif. 4 
F 19 Cl 35°5 Ms a 
a ee ee ea ac a ed lis 
S [ 
5 % ; Ag 108 Au 196°5 
= Dif, 12 
L "yf Na 23 os - T1203 
Dif.16 
Ko S98) Rbes5) a) (Cs) 133 rs 
O 16 S 32 Se 80 Te 129 PA 
Dif. 8 
” Ps Vi A137 W 184 
Dif. 8 
3 Mo 96 5 
: Dif. 4 
re Cr 52°5 ” 39 39 
os} 
by ee __ —— 
A aa 
is Zn 65 Cd 112 Hg 200 
Dif. 8 
G 9 Mg 94 0 ” Pb 207 
Dif. 16 
Ca 40 | Sr 87-5) Ba 137 5 
Bs As 75 Sb 122 Bi -—so210 
Dif. 4 
N 14 12 Bil ” ” ° 
Tole | es ae Se 
& 
fe B “ U 120 
A Dif. 4 
1B) al! Al 27°5 ” ”» 
Dif. 16 
A Ce 92 > 
” ” Sn 118 ” 
A Dif. 8 
3 © 12 Si 28 5 > sf 
S Dif. 12 
"> 4 Zr 89:5} Ta 138 - a 
A Dif. 8 
Ti 50 op ” Cb 195* Th, 231°5 
By a slight modification of the above table, the occupants 
of similar positions in different groups, having nearly the same 
* The analysis of niobic chloride by H. Rose gives 195, while the deter- 
mination of its vapour density by Deville and Troost gives 173 for the atomic 
weight of niobium, the mean being 184. 
