W. J. M. Rankine, Esq., on (he Elasticity of Vapours. 41 



The following table exhibits the comparative results of 

 observation and experiment. 



Table "VIII. — Vapour of Mercury. 



The discrepancies are obviously of the oi*der of errors of 

 obsei'vation, and the formula may be considered correct for 

 all temperatures below 200° C, and for a short range above 

 that point. From its wanting the third term, however, it 

 will probably be found to deviate slightly from the truth be- 

 tween 200° and 358° ; while above the latter point it must 

 not be relied on. 



I have not carried the comparison below 72 , because in 



