444 W. A. Norton—Molecular and Cosmical Physics. 
Effective attractions between contiguous molecular envelopes. 
n=5'143m| n=6'5m | n==6'9m | n=im | n='l-3m n=T'576m| n=8m no =1244] 
a|f ey fy ee eG ee wit x mk 
y : 
0°8r |0°567/0-Tr [0-381/0-%r (0-485 0-6r '0°183 
810-97 |0°677/0-8r |0-598/0-8r |0-691/0-7r |0°581/0-6r |0-514/0-4r \0-08] 
649) |0°725/0-9r |0°704|0-97 |0-787/0-8r |0°776)0-Ir |0-727/0-5r [1515 
T1-l 8; r |0°750\0-9 11/0-9r ‘Br \0°906)0Sr*1 
0°788'1-27 |0°865) 1-27 |0°959|0°9r4|2°208 
0°252/1-8r [0°520/1-6r |0-631/1-4r |0-705/1-4r |0-757\1-3r |0°832/1-3r |0-919) r (21 
0- r 0516 1-5r |0-6 724/1-4r4'0-805{ 1-47 |0-S79/1-Ir |19 
0°768|1-5r |0°836| 10r (0 
0-052! 107 |0°056! 20r |0 
n 
Uist fs *e/s 
0-690 L-5r 
0-050) 10r 
wT 
o> 
Oi 
be 3 
047/1-°67 |0°64 
44/107 |0-047/1- 1-6r 
0:009/207 |0-012! 207 |0-013) 10r 
645 
0-048! 10r 
20r 
f= Gp Ge The values of f” are in terms of 7. ‘The * indicates the 
value Oa (fig. 4, p. 339) of 2, for the zero of effective action of the molecules. 
e sign + indicates the value 0b of x for the maximum of effective attraction 
of the molecules. 
et 
It appears, therefore, that substances for which the ratio = 
secondary condition. — Liquids, and solids of feeble tenacity, .— 
less than that of india-rubber, may be elastic from the latter 
physical characteristics. Iron is the only substance whose elas- 
ticity is to be attributed to the former characteristics. Of all 
simple substances, iron has the greatest tenacity ; its molecules 
should therefore have the maximum value of ee 
Inelastic substances, so called, must either be those for which 
the ratio = is greater than 6-9, and which are in the secondary 
molecular condition, or those for which the same ratio Is less 
than 6-9, and are at the same time in the primary con apie 
In both of these cases the molecular envelopes will either ex- 
pand or contract when the distance between them is altere@ 
