846 PROCEEDINGS OF THE SOCIETY. 



and the whole of his attention was absorbed to an extent that would not 

 allow of his offering himself for re-election. There would, he anticipated 

 be no difficulty in continuing the Journal on its present lines, while he 

 w^as sure there were many Fellows both able and willing to undertake 

 the duties of microscopical Secretary. It was with the greatest reluctance 

 that he had found it necessary to resign, but, at the same time, he had 

 always felt that twelve years of one regime was as much as was good for 

 a society. 



Mr. John Meade's communication was read on " Stereoscopic Photo- 

 micrography," in which he claimed to have been the first to produce 

 stereo-photomicrographs. Specimens were sent in illustration. 



Mr. J. D. Hardy said he had a photo-micrograph which he had made 

 on the fame principle about seven years ago. It was of the eggs of the 

 domestic fly. 



Mr. E. M. Nelson said that the plan of taking stereoscopic photo- 

 micrographs in this way had been known for a long time. One way in 

 which they were done, was to cover up alternately each half of the 

 objective, taking a photograph from each, the two being afterwards 

 mounted as a stereoscopic picture. 



Mr. Crisp said the subject had been exhaustively dealt with many 

 years ago by Dr. Fritsch in his ' Ueber das stereoskopische Sehen im 

 Mikroskop und die Herstellung stereoskopisher Mikrotypien auf photo- 

 graphischem Wege " (1873), while Dr. Stein's ' Das Licht' contained a 

 good summary of the subject. 



The President said he had brought with him for inspection three 

 photomicrographs of one of the new rotifers mentioned in his ' Supple- 

 ment ' — Gomphogaster areolatus. They were unfortunately not good 

 specimens, but though very indistinct, they were sufficiently like the 

 drawing shown at a previous meeting to enable the creature to be recog- 

 nized as the same. It was necessarily very difficult to get a good 

 photograph of an object of this sort. 



Mr. E. M. Nelson said he had brought for exhibition a new 

 elementary centering substage which he thought was likely to be useful. . 

 It was fitted in the simplest manner by placing two lugs under the main 

 stage, and the movement was given to it with the finger ; it was very 

 inexpensive, and was only designed to render the ordinary student's 

 Microscope of a higher degree of efficiency by providing it with an easy 

 method of correctly centering the condenser and diaphragm. 



Mr. J. Mayall, jun,, thought that in this case Mr. Nelson had really 

 hit upon a novelty of design. The need of a simple and accurate 

 centering substage for inexpensive Microscopes had long been a serious 

 impediment to the skilful use of such Microscopes. Mr. Nelson's new 

 substage would add greatly to the efficiency of students' Microscopes at 

 small cost. He believed that a few hours' practice would enable any one 

 to master the use of the new substage, and he thought Mr. Nelson was 

 very much to be congratulated upon its production. 



The President said Mr. Eousselet was showing under his Microscope 

 a specimen of Limnias cornuella, a new and very pretty creature which 



