18 



all the curves in the month of October, indicating the opera- 

 tion of a secondary disturbing cause acting during that month 

 over the whole breadth of the two continents. 



In concluding, the Author remarks that the first application 

 of the method he has employed appears to be due to Dr. 

 Dalton, and that the only other application of it which he has 

 yet met with is in IVfr. Broun's very able discussion of the 

 Makerstoun observations. 



At the conclusion of the Paper, Mr. Robt. Worthington 

 expressed the high opinion which he entertained of the impor- 

 tance and value of the observations brought forward by Mr. 

 Baxendell, as forming a new step in the method of discussion 

 of the disturbances of atmospheric pressure in which a definite 

 mode of measurement was adopted. He knew, from his own 

 experience, how laborious such an investigation was, involving 

 as it did, many scores of thousands of numerical operations. 

 It was important to understand that the observations used 

 by Mr. Baxendell were those published by some recognised 

 meteorological institution. 



The Chairman remarked that the Paper just read afforded 

 striking proof of the great value of the Society's library of 

 reference, which was fast becoming one of the most complete 

 in the country. Without the help of the library the collection 

 and arrangement of all these observations would have been 

 impossible ; and he strongly urged the members to assist in 

 rendering more effective so important a part of the Institution. 



