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 Mr. 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. 
