PROCEEDINGS OF THE SOCIETY. 409 



The Chairman, in asking for remarks upon the subject, said that 

 he was sure all would agree that they had had a most interesting and 

 instructive paper, one of that kind the bare reading of which could 

 give them no idea of the amount of work involved in so completely 

 working out the subject. He should look forward to the pleasure of 

 reading it in the Journal, especially the introduction, which gave them 

 such an excellent idea of the means by which the results recorded had 

 been classified. He was sure also that all present would agree that they 

 had had a very magnificent exhibition of lantern slides, most of which 

 were exceedingly good. He should, however, like to ask what was the 

 magnification of the objects on the slides ; were they all the same scale ? 

 because, unless they knew this, they could not so well appreciate the 

 difference in size of the objects as they appeared seriatim upon the 

 screen. 



Mr. Arthur Earland pointed out that no uniform scale had been 

 adopted, because the objects themselves differed so greatly in size that 

 whilst some would appear gigantic, others would be invisible upon the 

 screen, and the magnifying power under which the photographs for 

 these particular slides were taken, varied according to circumstances 

 from 20 to 160 diameters. 



Mr. Heron-Allen said that though this was necessarily the case with 

 the lantern slides, in the illustrations made for the paper the objects 

 would all be shown on the same scale. 



The Chairman was glad to hear that a uniform scale had been 

 adopted for the illustrations, as he had always regarded it as a matter of 

 importance that when illustrations were given of microscopic objects, 

 the scale on which they were taken should be indicated. 



A hearty vote of thanks to Mr. Heron-Allen for his interesting and 

 instructive paper was unanimously carried. 



Mr. E. J. Sheppard, F.R.M.S., read a paper " On the Disappearance 

 of the Nucleolus in Mitosis," the subject being illustrated by photo- 

 graphs and drawings on the board — also by four examples, three 

 vegetable and one Epidermis of Tadpole, exhibited under Microscopes 

 in the room. It was mentioned that the photographs had been taken 

 with a T V"in. oil-immersion objective, except in one case where a £-in. 

 objective had been used. 



Prof. E. A. Minchin, in reply to the invitation of the Chairman to 

 make some remarks upon the paper, said he had listened with great 

 interest to the author's statements, bnt disclaimed any special knowledge 

 of the subject, upon which much had been written and many different 

 views had been put forward. 



Mr. Sheppard said that the processes which he had drawn upon the 

 board, were, in comparison with the number of cells, rather few, but 

 their association with the chromosomes showed that the nucleolus was 

 absorbed or taken up by the chromosomes. It would be found, upon 

 careful observation, that these threads or nucleolar projections were 

 actually in contact with the chromatin thread or granules, and apparently 

 become visible at an early stage of the spireme formation. 



