PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 20th of February, 1901, at 20 Hanover Square, W. 

 A. D. Michael, Esq., F.L.S., Vice-President, in the Chair. 



The Minutes of the Meeting of 16th of January, 1901, were read 

 and confirmed, and were signed by the Chairman. 



The List of Donations to the Society received since the last Meeting 

 (exclusive of exchanges and reprints) was read, and the thanks of the 

 Society were voted to the Donors. 



From 

 Braithwaite, R., British Moss Flora. Pt. xx. (4to,\ „, . ,. 



London, 1900) / The Author. 



Pierce, Newton B., Peach Leaf Curl. (Svo, Washington,! United States 



1900) J Department of Agriculture. 



" Double Reflecting Microscope " by P. and J. Dollond Mr. J. J. Kern. 



Two Objectives. 2 in. and l/t> in., by Andrew Ross .. Mr. F. R. Dixon- Xut tall. 



A remarkably well-taken photograph of Amphipleura pellucida was 

 sent for exhibition by Mr. Brewerton, and was handed round for the 

 inspection of the Fellows. 



Mr. E. M. Nelson said the photograph was very interesting, because 

 it showed the transverse strife as thin in comparison with the spaces 

 between them ; the striae also were carried quite up to the apex. This 

 was another instance in which some optical theorists were proved to be 

 wrong. They said that the striae and the spaces must be of equal width, 

 whereas he had affirmed that the strife were much finer. In many 

 photographs of this object they appeared to be of equal width, but that 

 was only because the object had been badly photographed. In the 

 example before the Meeting the photograph bad been properly taken, 

 and therefore exhibited a difference in the thickness of the lines and of 

 the interspaces. 



The Chairman said he did not remember to have ever seen a more 

 remarkably clear photograph of this very difficult object than the one 

 now shown by Mr. Brewerton. 



Mr. G. H. J. Rogers, of Maidstone, exhibited a contrivance, differing 

 to some extent from that of Mr. Macer, for exhibiting the proboscis of 

 a fly, and read a short note describing it (see p. 220, fig. 37). 



The Chairman thought the Fellows present would be very pleased to 

 see this very pretty little apparatus. Various devices had been adopted 

 for this purpose, and he remembered that Mr. Suffolk at one time ex- 

 hibited the proboscis in a similar way, although perhaps not with exactly 

 the same apparatus. 



Mr. Beck said Mr. Macer's method had the further advantage, that 

 being held in a pair of forceps, the object could be rotated so as to get 

 a view of it from different aspects. At one of their soirees Mr. Macer 

 showed, in a very satisfactory manner, a fly eating honey, the honey 

 being held in one pair of forceps and the fly in another. He remembered 

 this as being one of the most attractive objects shown on that occasion. 



