October lytk, r^ii.] Proceedings. v 



blindness — is foreshadowed in this letter, which contains, 

 probably, the earliest account of that peculiarity of vision. 



On October 3rd, 1794, John Dalton appeared as a memlier 

 of the Society, and on the 31st of the same month made his 

 scientific debut by reading a paper entitled " Extraordinary Facts 

 relating to the Vision of Colours." 



Mr. Nicholson thought that this interesting relic of perhaps 

 the greatest man who ever belonged to this Society should be 

 preserved in the Society's House, and he generously presented 

 it to the Society. 



Mr. H. J. WooDALL, A.R.C.Sc. (Lond)., read a paper on 

 " Mersenne's Numbers." 



The paper is printed in full in the Memoirs. 



A resume of a paper by Mr. S. Hirst (Brit. Mus. Nat. 

 Hist.), entitled " On a Collection of Arachnida and 

 Chilopoda made by Mr. S. A. Neave in Rhodesia north of the 

 Zambesi," was given. 



The paper is printed in full in the Memoirs. 



General Meeting, October 31st, 191 1. 



The President, Professor F. E. Weiss, D.Sc, F.L.S., in the Chair. 



Mr. Charles F. Butterworth, U'aierloo, Poynton, and 

 Miss Margaret Colley March, M.Sc. (Mane), The University, 

 Manchester., were elected ordinary members of the Society. 



Ordinary Meeting, October 31st, 19 11. 



The President, Professor F. E. Weiss, D.Sc, F.L.S., in the Chair. 



A vote of thanks was given to the donors of the books upon 

 the table. 



