109 



are certainly greatly below the truth. Upon the present 

 occasion, therefore, I can direct attention only to the obser- 

 vations made in July and August last. These are contained 

 in the following table, and, as has been already stated, they 

 amount to twenty in number, the highest temperature 

 having been 65°, and the lowest 49°-6. The numbers in the 

 last column represent the bulks which the 911-64 volumes 

 of dry air would have, if reduced to the temperature t, and 

 the corrected pressure p. 



From the first, last, and second last columns of the pre- 

 ceding table, the force of aqueous vapour has been calcu- 

 lated in the mauner already explained. The values thus 

 obtained are exhibited in the second column of Table II. 



