230 DISCUSSION AT SHEFFIELD 



this should be so. With regard to Mr. Monypenny's criticism of 

 the diameter of the halos, he had formed his conclusions on the 

 ordinary laws of optics, and there was no very obvious reason for 

 departing from it. 



Mr. J. H. G. Monypenny said he was quite in accord with what 

 had been said with regard to magnification, that the limit is reached 

 at 1,500 diameters. The only advantage in photographing above 

 1,500 (apart from photographs for reproduction purposes — in which 

 case enlargement is sometimes desirable), might be in the case of 

 a man whose vision was not as good as it might be, or who did 

 not wish to tire his eyes examining every detail. 



The Chairman, in concluding the meeting, said : We are very 

 glad to have had the opportunity of discussing in Sheffield the papers, 

 on microscopy which were recently read before the associatie-d Socie- 

 ties in London, and I think I may say that this Association is 

 grateful to Sir Robert Hadfield for making the suggestion that such 

 a further discussion should take place. If, and when, the Faraday 

 Society has another Symposium on some other subject, this Associa- 

 tion will, I am sure, be pleased to arrange for another joint local 

 meeting on the lines of that held to-night. 



