262 PROCEEDINGS OF THE SOCIEJY. 



The President then proposed a vote of thanks to Mr. Angus for so 

 kindly lending the Microscopes for the evening's demonstrations. ; The 

 vote of thanks was carried unanimously. 



The President announced that "the next Meeting of the Society 

 would be held on March 21, at 8 o'clock, and the next Meeting of the 

 Biological Section on March 7, at 7 o'clock, when Dr. J. Rudd Leeson 

 would communicate " Observations on the Radula3 of the Gasteropoda "" 

 (to be illustrated with numerous slides). 



New Fellows : — The following were elected Ordinary Fellows of 

 the Society : Dr. A. A. Perira, Miss Nancy M. Robinson, Mr. Robert 

 S. W. Sears. 



The following Specimens, Apparatus, etc., were exhibited: — 



By Dr. A. H. Drew and Dr. Una Griffin : — • 



Amocla huccalis sp. n., from case of pyorrhea, showing all nuclear 



chromatin in one piece. (Iron-hsematoxylin stain.) 

 A. huccalis, from an anaerobic culture at 37° C. (Hfematoxylin 



stain.) 

 A. huccalis sp. n., from anaerobic culture. (Stained by Giemsa.) 

 Entamocha gingivalis, from case of acute pyorrhoea, sliowing the 



small central caryosome and the ring-shaped arrangement of 



chromatin. (Iron-h^matoxylin stain.) 

 E. gingivalis, from case of pyorrhoea. (Stained by Giemsa.) 

 Spirochgetes, from acute pyorrhoea. (Congo-red film.) 



By Dr. J.'IV. Cropper : — 



Bacteria isolated from impure amoeba cultures. Amoeba was 

 subsequently grown in " pure-mixed " culture with each of the 

 following : — • 



Bacillus prodigiosiis. 

 B. flavo-coriaceus. 

 Amoeba parasite. 



B. finorescens non-Uqmfaciens. (Gelatin slope.) 

 „ „ (Gelatin stab.) 



„ „ (Plain gelatin slope.) 



Amoeba and B. Jiuorescens non-liquefaciens. 

 Plain agar stab. 

 „ „ slope. 

 „ gelatin slope. 

 Method of counting Entamosha coli cysts in a 2 • 5 p.c. emulsion. 

 " Culture concentrate " of stools containing E. coli cysts. 

 Enumeration of E. coli cysts in an " ether concentrate of stools." 

 Culture concentrate of E. histolytica (scanty infection). 

 Debris removed from a " concentrate " by filtration through silk, 

 demonstrating the few cysts relative to the debris. 



