394 



PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 19th of Apeil, 1905, at 20 Hanover Square, W., 

 D. H. Scott, Esq., F.R.S., etc., President, in the Chair. 



The Minutes of the Meeting of the 15th of March, 1905, were 

 read and confirmed, and were signed by the President. 



The List of Donations to the Society, exclusive of exchanges and 

 reprints, received since the last Meeting, was read, and the thanks of 

 the Society voted to the donors. 



From 

 Hyatt-Woolf, C. The Optical Dictionary. (8vo, London,) y^ g Publishers 



1904) / 



Winslow, C. E. A. Elements of Applied Microscopy. (New) y^ g Publishers 



York, 1905) / 



An Old Portable Microscope. By W. & S. Jones Mr. W. S. Sogers. 



The Old Portable Microscope by W. & S. Jones, presented by Mr.. 

 W. S. Rogers, was described by Mr. Pousselet in a short paper read by 

 the Secretary. 



Mr. W. J. Dibdin exhibited a slide of Bacillus typhosus, and ex- 

 plained the method adopted in staining and mounting. He also. 

 exhibited some photomicrographs of this organism with well-displayed 

 flagella, taken by lime-light with a 8 minutes exposure under a T V in. 

 apochromatic objective x 5000 diameters. He stated that he had 

 found the flagella to be much more frequent in cultures incubated at 

 a temperature of 40°, and that they were only present in the young 

 specimens, the average length of the flagella being about ten times the 

 length of the body. He suggested that the use of this might be to 

 enable the bacillus to hold on to the tissues until a more mature stage 

 was attained. In one case he thought some of the flagella were bifur- 

 cated, but examination under a power of 5000 diameters proved that 

 this was not the case. 



The President, after inspecting the slide referred to, said he bad 

 never seen the flagella so well previously as they were shown under the 

 Microscope on the table. In the photographs, also, they were re- 

 markably distinct, and he thought Mr. Dibdin was to be congratulated 

 upon his success. The flagella were important as bearing on the 

 affinities of the Bacteria. Ciliated zoospores were known in certain 



