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could be but one opinion regarding the value of this collection — 

 it was simply unique — there was nothing like it, and he was sure 

 they would pass a very cordial vote of thanks to their kind friend 

 for his valuable present. This having been put to the meeting 

 from the Chair, was carried with applause. 



Mr. E. M. Nelson said he was much obliged to the members for 

 the way in which the President's remarks had been received ; he 

 only wished it had been possible to obtain the complete collection, 

 but he found it was not. 



Mr. Nelson then read a paper upon Diatom structure as 

 illustrated by specimens of " Coscinodiscus Asteromphalus,^' diagrams 

 in further elucidation of the subject being drawn upon the board. 



Mr. Morland in reply to the President said he had seen the 

 slide upon which the particular specimen described by Mr. Nelson 

 occurred, and thought that the appearance of immaturity was 

 due to a want of silex ; he also thought that instead of growing 

 from the centre to the outside it was deposited simultaneously all 

 over. He thought the other form described was possibly a form 

 of Raphoneis, but could not be certain ; it might be a described 

 form, or a variation from some recognised type. 



The President said Mr. Nelson had been good enough to come 

 to their assistance that evening by providing the only paper on 

 the agenda, and this paper they would agree with him in thinking 

 a very excellent one. He was personally very much interested in 

 these questions of minute structure, and had through Mr. Nelson's 

 kindness been privileged to examine many of his specimens. He 

 had got as far as secondary structure ; but now it seemed they 

 had been taking a step farther, and had got to tertiary structure, 

 and he was afraid he should be obliged to worry Mr. Nelson until 

 he let him see this also. 



A vote of thanks to Mr. Nelson was then unanimously passed. 



Mr. Nelson said he was indebted to Mr. Ingpen for this 

 beautiful slide, the material of which came from the Nottingham 

 deposit. It was just the sort of slide he liked to get hold of for 

 this purpose, with the diatoms smashed up all over the slide. He 

 had no intention of making another new species. 



Mr. Ingpen said, as to the slide, its condition was no doubt 

 only a page in a chapter of accidents ; he scarcely remembered 

 which one it was, but believed it had been sent to him as a sample 

 of mounting in high refractive media ; he believed in this case 



