612 PROCEEDINGS OF THE SOCIETY. 



obliged to the Fellows for tlie kind reception they had given to him as 

 a visitor from a kindred Society in a distant city. 



Mr. E. M. Nelson's paper on " A means for the detection of Spurious 

 Diffraction Images " was read. 



Mr. T. F. Smith said he should like to have some demonstration 

 from Mr. Nelson as to the doubling of the width of the grating, because 

 he "held that if an object was delineated at all it was delineated 

 correctly." ^^ 



The President said there remained to him now only the pleasant 

 task of wishing the Fellows of the Society a very happy vacation, ex- 

 pressing at the same time a hope that they would be able to bring 

 something back with them of interest to future meetings. 



The following Instruments, Objects, &c., were exhibited:— 



Miss Abrahall : — Lithographic Drawings of microscopic objects. 



Mr. C. L. Curties : — 1/2 in. Apochromatic Objective by Zeiss, and 

 Abbe Achromatic Condenser. 



Dr. C. T. Hudson : — Model of ConocJiilus. 



Mr. T. Powell :— 1/12 in. Horn. Imm. Objective. 



Mr. Gnnson Thorpe: — Two Slides oi Megalotrocha semihullata. 



Mr. Western : — Slide of Asjplanchna n. sp. 



Mr. T. Whitelegge: — Slides of AsplancTina n. sp. and Lacinularia 

 n. sp., and an unknown organism. 



New Fellows : — The following were elected Ordinary Fellows ; — 

 Messrs. John Goodfellow, B. M. Winder, F.C.S., and Thomas White- 

 legge. 



