xviii Proceedings. [March 15th, igo4... 



which have hitherto been made only determined the total 

 number of ions present but not the rate at which they recombined 

 or formed. Some experiments made in a field near Rochdale on- 

 Sunday, February 28th, gave 2,400 for the number of ions in 

 each cubic centimetre of air, and a formation of 18 new ones in 

 each second, while on the roof of the Physical Laboratory at 

 the Owens College on the Monday the numbers were 3,600 with. 

 a formation of 38 fresh ones each second. 



General Meeting, March T5th, 1904. 



Professor W. Boyd Dawkins, D.Sc, F.R.S., President, 

 in the Chair. 



Dr. Arnold W. Lea, of 252, Oxford Street, Manchester,, 

 was elected an ordinary member of the Society. 



Ordinary Meeting, March 15 th, 1904. 



Professor W. Boyd Dawkins, D.Sc, F.R.S., President, 

 in the Chair. 



The thanks of the members were voted to the donors of the 

 books upon the table. 



The President stated he had to announce, with great 

 regret, the death of Mr. J. J. Ashworth, a member of the 

 Society. 



Mr. Charles Bailey, M.Sc, F.L.S., spoke of the services 

 the late Mr. Ashworth had rendered to the Society in his capacity 

 of Hon. Treasurer, which office he held for a number of years. 



Mr. J. Cosmo Melvill, M.A., F.L.S., exhibited from his 

 Herbarium {a) a specimen of the Tulip Tree, from North 

 America, with the following inscription on the label, in the 

 handwriting of C. von Linne (Linnaeus). — " Liriodendron 

 tulipifera Lin. Sp. PI. I., p. 755 n. i. Specimen debeo viro 

 nobili Petro van de Poll." Other Linnean specimens are,, 

 besides this, to be found in the collection, {b) A sheet of 

 Sprengelia incarnata Sm. Nat. Ord. EpacridecB, from New South. 



