a 
- between the Equivalent Numbers of Elementary Bodies. 109 
3 Atomic Relation of 
Differences. Volume. At. Vol. 
89 or Se a te RT ac 
twice 44°5 Silver, - = ts 10°35 - ee 
4 J * 
Copper (€u==63°4), - F2T) + i 
settled, the relation may be soe pie exact. If we take the 
per and silver the number 44: , half the difference between the 
equivalents of silver and gold, with mathematical exactness. 
, Atomic Relation of 
Difference. volume. At, vol. 
i Tungsten, - —- WAR: eae t 
Molybdenum, - O65 on se 4 
In the series Hg, Cd, Mg, Zn, similar analogies are not well 
marked: the atomic volumes of the three first metals are not 
very far apart, ; 
; Atomic volume. 
Hg, - : om < TAT 
Mg,* - - - 6°85 
change 
According to L. Gmelin, the specific gravities on which he based 
