259 



PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 21.st of February, 1012, at 20 Hanover Square, W. 

 H. Gr. PLiMiiER, Esq., F.R.S., President, in the Chair. 



The Minutes of tiie Meeting of January 17th were read and con- 

 firmed, and were si2:ned bv the President. 



The President said that since their last Meeting they had lost by 

 death one of their most distinguished Honorary Fellows, Lord Lister. 

 Everyone knew of his great work, and of the great services he had 

 rendered to surgery and to mankind. But it was also a point of special 

 interest for Fellows of the Royal Microscopical Society to know that 

 many of Lord Lister's early investigations, before he began his strictly 

 surgical work, were in the field of Microscopy, and he had more than 

 once expressed the wish thai he could again find time for microscopical 

 study. In view of the conditions of his long and honoured life, it was 

 deemed fitting that a letter of condolence should be sent to Lord Lister's 

 family from the Royal Microscopical Society, expressing their feeling 

 of the great loss sustained not only by them but by the whole world. 

 He was sure that this resolution would meet with the approval of the 

 whole Society. 



The following donation, received since the last Meeting, was 

 announced, and the thanks of the Society were voted to the donors : — 



From 

 Chas. E. Gabel, Microscopy and the Microscopical Examina- \ mj, t> hv i, 

 tion of Drug. (Des Moines, Iowa, The Kenyon Co., 1911) . . j -^"^ ^twiisners. 



Mr. E. J. Spitta then made a communication " On the Colouring of 

 Lantern Slides," and, with the help of the projection lantern, demon- 

 strated the principles which should influence the photographer in the 

 preparation of negatives from which coloured lantern plates were sub- 

 sequently to be made. Commencing with photographs of the spectrum 

 taken upon the various sensitized emulsions at present on the market, 

 he pointed out the necessity for the use of panchromatic plates — that 

 is to say, plates coated with emulsion equally sensitive to all the colours 

 of the spectrum ; for if ordinary plates were used, the lantern slides 



