connected with rs Surface Tension. 159 
: Xr 
Table V. It will be seen that in most cases the value of — 
1 
‘differs very considerably from that of 
3296 — 
m 
indicating that the fused substances consist of a mixture of 
molecules polymerized to different extents. We would, of course, 
expect that the molecular weight of these substances is not that 
‘indicated by their chemical formula since fused metals and salts 
do not possess any appreciable vapour pressure. But this in- 
vestigation gives additional information. It will be seen that in 
the case of each of the four substances S, S,, Cd, and P, each 
molecule is polymerized to the same extent. 
