440 



Mr. Yezey thought it might be interesting to the members to 

 hear that Mr. C. J. Pound — one of their number — had recently 

 been elected President of the Poyal Society of Queensland. 



Mr. W. Stokes read a paper " On some Cheap Monochromatic 

 Light Filters," in which he described some experiments he had 

 made with coloured gelatine films so combined as to allow only a 

 single colour to pass through ; also some attempts to attain the 

 same end by means of glycerine jelly stained with aniline dye. 



Mr. E. M. Nelson was glad to hear that something further 

 was being done in this direction, and hoped that these experi- 

 ments with coloured gelatine would be pushed as far as possible, 

 because they were cheaper and less liable to get out of order than 

 the fluid screens, but as yet they were hardly luminous enough ; 

 probably better specimens of gelatine could be obtained. 



Mr. Karop thought it w T as possible that the difficulty men- 

 tioned in connection with the glycerine jelly might be due to the 

 fact that it was a compound, and that it might perhaps therefore 

 precipitate the aniline. 



Mr. Pheinberg had made a very good screen by floating a 

 little collodion on glass, mixed with a little malachite green. 

 When tested with the spectrum it was found to pass the F line. 



The thanks of the meeting were voted to Mr. Stokes for his 

 communication. 



Mr. T. B. Posseter read a paper " On the Experimental In- 

 fection of Ducks with Cysticerci," in continuation of his paper 

 read before the Club on November 20th, 1896. The subject was 

 illustrated by drawings and diagrams, and by the exhibition of 

 1 mounted specimens under the microscope. 



The President congratulated Mr. Posseter upon the very 

 interesting paper which he had read, and expressed a hope that 

 some further remarks would be made upon the subject by the 

 members present. 



Mr. Karop feared that this was a subject which Mr. Posseter 

 had all to himself. No doubt, however, the members had been 

 greatly interested in the account which he had given of his 

 investigations, and he was quite sure the paper was one which 

 would be a credit to any Society. 



Mr. Posseter expressed his thanks to the Club for the way in 

 which his paper had been received, although the subject might 

 possibly indicate a somewhat morbid taste on his own part. 



