204 



practically a very intense incandescence. When they remembered 

 that 10,000 diameters meant 100 millions of times dilution, it 

 was obvious that a very intense light was essential. He had been 

 very much interested by Mr. Schroeder's paper, and especially with 

 his description of the electric lamp. 



The President was sure the members would pass a hearty vote 

 of thanks to Mr. Schroeder for what they would agree was a very 

 valuable and interesting paper. 



Mr. E. M. Nelson read a paper " On the Structure of the 

 Nodules of Pleurosigma," the subject being illustrated by photo- 

 graphs and drawings shown upon the screen. 



The President said the subject of high -power definition and 

 illumination was one which Mr. Nelson had made peculiarly his 

 own, and the members of the Club knew how to prize any 

 communications of this kind from him. 



Mr. Moreland said that until Mr. Nelson called his attention 

 to the matter he had not noticed the special points referred to, 

 and must therefore accept his statements; but as regarded his 

 deductions, he thought they hardly had enough information to 

 enable them to come to a definite conclusion, and he thought 

 before doing so they would have to examine more carefully the 

 other forms in which the central raphae terminated in a similar 

 way. 



Mr. Mainland said that some years ago he worked out the 

 structure of some diatoms found in tooth powder, and he then 

 particularly observed the nodes of the pipes curving in opposite 

 du'ections. 



The President said he felt sure they would pass a hearty vote 

 of thanks to Mr. Nelson for his interesting paper. Recently he 

 had been doing a little work with Quinidine as a mounting 

 medium, and he had found that the nodules assumed all sorts of 

 different positions whilst this medium was cooling. It was an 

 interesting matter which had been brought before them, and he 

 should be glad to hear that other members were taking it up. 



A vote of thanks to Mr. Nelson was unanimously carried. 



Notices of meetings, etc., for the ensuing month were then 

 made, and the proceedings terminated with the usual conversa- 

 zione. 



