262 PROCEEDINGS OF THE SOCIETY. 



folding arm, could be slid up aud down and adjusted at the focus re- 

 quired on to the point of the needle or scalpel ; and once adjusted the 

 work could be carried ©n without further movement. 



Mr. Shillington Scales pointed out that an instrument of an almost 

 exactly similar nature was in common use among medical electricians for 

 electrolysis purposes, and was figured in the catalogues of manufacturers 

 of electro-medical apparatus. 



Mr. E. J. Sheppard exhibited and described two slides. 1. A vertical 

 section through the four upper central incisors of a kitten about six 

 days before birth, passing through nearly an equal plane in each tooth. 

 Such sections were difficult to obtain, since the central incisors were set 

 in a plane slightly anterior to that of the lateral incisors. In staining, 

 the entire upper jaw was first stained in Imlk with paracarmin, then 

 embedded in celloidin and sections cut. These sections were then 

 stained for about six minutes in the following : (A) ■ 5 grm. water- 

 soluble auilin-blue dissolved in 50 c.cm. of water ; (B) 0*5 grm. spirit- 

 soluble anilin-blue dissolved in 50 c.cm. of spirit. A and B were slowly 

 mixed and then filtered. After staining, the sections were well washed 

 in spirit, differentiated in spirit and mounted in parolein in order to 

 preserve the blue colour. 



2. The ovum (of a mouse), antecedent to leaving the ovary, showing 

 the second maturation division, a phenomenon he had always believed 

 took place in the Fallopian tube. 



Mr. Rousselet then descriljed four Rotifera from Devil's Lake, a 

 large brackish water lake in North Dakota. The exhibit was interesting 

 from the point of view that all four specimens lived in In'ackish water 

 only. One was PedaUon fennicimi Levander, first found in Finland ; 

 another was a new species, Brachionus i^patiosu><, and would be described 

 at the next Quekett Club Meeting ; the third was B. salaiiicvs Rouss., 

 known only from this locality, and the fourth was Asplanchna Silvestrii 

 Daday, 6 and ? , first found in South America, showing dimorphism in 

 the female. 



The Chairman proposed the cordial thanks of the Society to Mr. 

 Sheppard, Mr. Rousselet, and Mr. Beck for their communications, which 

 was carried with acclamation. 



Mr. Rousselet then described two old Microscopes— l>eautiful instru- 

 ments by Cuff and by Watkins and Smith— which Mr. T. H. Court had 

 been good enough to send for exhibition. 



The thanks of the Society were cordially voted to Messrs. T. H. 

 Court and C. Rousselet. 



The Chairman put before the Meeting the nomination paper of 

 Dr. Eugene Penard for election as an Honorary Fellow of the Microscopi- 

 cal Society, signed by Messrs. Hopkinson, Rousselet, Woodward, himself. 



