PROCEEDINGS OP THE SOCIETY. 1123 



Microscope ; they were of a sarcodic character and apparently of an 

 amoeboid nature, and were furnished with long and very fine setfe. 



The President remarked that the organism had a very AdinophryS' 

 like appearance ; but he had seen so many variations in form, that he 

 thought this might very likely prove to be only a variation, though if 

 there were many siiecimens found under similar conditions, it might 

 be regarded as a new species. It would hardly be safe to conclude 

 much from a single specimen. 



Mr. W. B. Turner's paper, " On some new and rare Desmids," was 

 read [supra, p. 933). 



Dr. E. Giltay's paper " On the; Amplifying Power of a Lens or 

 Objective " was read, in which he criticized a note on the same subject 

 by Prof. Abbe (supra, p. 960). 



Mr. Crisp gave a resttme of his paper " On the Limits of Eesolu- 

 tion in the Microscope," in which he pointed out that wht^n mono- 

 chromatic light and photography were used in place of wliite liglit 

 (line E), the limit of resolution rose from 146,543 lines to the 

 inch to 158,845 and 193,037 respectively {supra, p. 968). 



Dr. Maddox asked if it was likely that photograjihy would depict 

 details which the eye could not see. Theoretically it had been 

 shown by what Mr. Crisp had stated that this might be possible, and 

 in practice he had always thought he could detect in a good negative 

 details which he was unable to make out by direct vision. 



The President said that there appeared to be reason for supposing' 

 that such would be the case. Prof. Koch, some six years ago, men- 

 tioned the case of a bacterium, in which he could not see the flaorella 

 with the Microscope, but had photographed them. 



Mr. J. Mayull, juu., said that some years ago he had been in 

 correspondence with Dr. Woodward on that very point, and he had 

 stated that in his experience nothing whatever could be seen by the 

 aid of photography which the eye could not see with the Microscope, 

 using monochromatic light. 



The President said that Prof. Koch published his results at the 

 time and sent them to him ; and he remembered that he stated that, 

 though the flagella were suspected, he was unable to detect them with 

 tlie eye, but that lie had done it with the camera. 



Mr. Mayall said that the point to which he referred related simply 

 to Nobcrt's lines. He had himself taken tlie same view of the matter 

 as that now mentioned, but Dr. Woodward took the oi)2)osite side. 

 He thought he could count the lines more readily in the photographs, 

 but Dr. Woodward said it was not so in his experience. The cor- 

 respondence was commenced in consequence of a criticism i)ublislie(l 

 by Dr. Woodward in a paper in the Montlily Microscopical Journal 

 in 1870. 



Dr. Lavis's paper "On the Preparation of Sections of Pumice and 

 otlier Vesicular Hocks " was read. 



