346 



Mr. Gervaise Le Bas on the 



This tendency to vary has been found chiefly among the 

 0, N, S, and P atoms. Monovalent atoms do not apparently 

 vary in this way. 



Ihe Volumes of the Atoms in Compounds 

 at the P.P. 



H 3-70 



Zn 20-0 



14-8J N 11-11 Oc 74 (O')^ F 87 



15-6 J 11-0^0 | 



y 



; 



o.x 8-3 ; 



Si 32-0 P 27-281 S 22" 1 1 01221 



27-1 J 25-6 



Ti 35-7 V 31-7 Or 27"4 



Ge 35-8 As 281 Se 28*0 Br 27-28 



Hgl8- 



Sn 42-3 Sb 30-4 Te 



I 37-0 



If we arrange the volume of the atoms as shown in the 

 combined state at the boiling-point on a diagram, we obtain 

 the following remarkable series of curves. 



45 



40 



35 



^ 30 



^25 



^ 20 



15 





















__ 



Sn 











TF 



^^- - 



--- 



- ■ — * 











I 





SL 







I-"' 









^ 



--• 



^ 



<SI 



VJ 



/ 



P^ 





Sf--" 



^ 



As B 



"Br 











/ 



%/ 



fa 









Perioc 



ic Rei 



.ATIOIM 



BETV\ 



EEN 





1/ 



J 



J 









TH 



E ATC 

 OF 1> 



MIC V 



e Eli: 



'EIGHT 



MENTS 



5 





Jj 



V 











I 



n 



Monc 



Diva 



valerrt 

 lent 













i 

 F 











m 



IV 



Tr i v 

 Tetr 



ilent 



avale. 



it 







10 



30 



50 70 90 



Atomic Weights 



130 



If we examine the curves, we find that — starting from the 

 members of the First Period, the numbers relating to the 



