PROCEEDINGS OF THE SOCIETY. 391 



way in which Mr. J. W. Gordon worked out a method of measuring 

 wave-lengths from this instrument without any reference to tables — 

 (Mr. Gordon's diagram was here shown and explained) — wave-lengths 

 being read off in millionths of an inch. The apparatus formed a simple 

 and quite inexpensive spectrometer. 



Mr. Rheinberg said that a few months ago he had had the honour 

 of exhibiting to them a series of photographs of diatoms taken by Dr. 

 A. Kohler with the Zeiss ultra-violet light apparatus. By that gentle- 

 man's kind permission, he was enabled to show them that evening a 

 farther very fine set of about :->5 ultra-violet light photomicrographs of 

 physiological, botanical, and other subjects. Special attention was 

 directed to a series of photos of cells of Salamandra maculosa, in various 

 stages of cell-division ; and attention was also drawn to a section through 

 the eye of a tadpole, in which the crystalline lens appeared black — 

 this being a good example of the changed appearance of structure 

 which may arise from the fact that bodies transparent to ordinary 

 light may be more or less opaque to ultra-violet rays. 



The thanks of the Society were voted to Mr. Beck and to Mr. 

 Rheinbere: for their exhibits. 



A letter from the Secretary of the Selborne Society was read, inviting 

 the assistance of Fellows of the R.M.S. as exhibitors at the conversazione 

 to be held on May 25. 



The President said they were unable to devote any time to obser- 

 vations upon the matters which had been brought before the Society, as 

 that was the ' great evening of the year with them, when they had their 

 exhibition of microscopic pond-life. He wished to express the thanks of 

 the Society to those who were exhibitors on that occasion, and to say 

 that they were particularly grateful to the Members of the Quekett Club 

 who had shown their good feeling and loyalty to the Society by coming 

 forward in such large numbers to contribute to the success of the evening. 

 The thanks of the Society were also due to Mr. Baker for the loan of a 

 number of Microscopes for the exhibition of objects. 



The votes of thanks being put to the Meeting were unanimously 

 carried. 



New Fellows.— The following were elected Ordinary Fellows : 

 Messrs. Clemert Campbell Ellis and Mansell James Swift. 



The following Instruments, Objects, etc., were exhibited : — 



Mr. Conrad Beck : — A Simple Wave-length Spectroscope. 



Dr. J. M. Bernstein : — Phagocytosis of the Malarial Parasite ; Blood- 

 film showing leucocyte containing pigment, the remains of a malarial 

 parasite, stained with methylen-blue and eosin, x 1000. 



Mr. J. Rheinberg : — A series of 35 photomicrographs of physical, 

 botanical, and other subjects, taken by Dr. Kohler with the Zeiss ultra- 

 violet light apparatus. 



