448 Lieutenant Rennt on a new Barometric Formula, ^c. 



consideration of the hygrometric state of the atmosphere requires such a cal- 

 culation as that employed in this paper. 



Although the error belonging to the formulce given in the " Proceedings of 

 the Royal Irish Academy," vol. n. p. 565, and vol. ui. p. 322, be not consider- 

 able, and although they are an obvious improvement upon the formulje in pre- 

 vious use, yet as they are erroneous in principle, they ought not to be retained, 

 seeing that they are replaced by the more correct formulse of the present 

 paper. 



N. B. — The equation already published (vide " Proceedings of the Royal 

 Irish Academy," vol. ii. p. 565, and vol. ni. p. 322), viz. : 



p p' 



in order to harmonize with this paper, ought to be 



P 



V X 



P-iF 



I 



J 



