PROCEEDINGS OF THE SOCIETY. 555 



objective so used not ouly gave very oxcellont definition but also 

 sufficient field of view. The only fitting required was an adapter 

 sliding into the tube and into which the objective would screw. It 

 was of no consequence what was the length of tlie tube, because 

 whether placed close to the lower objective or at ten or more inches 

 from it, the arrangement performed equally well ; the field was also 

 very fairly flat. 



Mr. Ingpen in reply to a question said he could add nothing to 

 what Dr. Matthews had said upon the subject. He had used objec- 

 tives in the manner described, because he saw them suggested by Sir 

 John Herschell, and he obtained very good results. 



Mr. Curties called attention to some excellent photographs of 

 microscopical objects, the production of one of the Fellows of the 

 Society, Mr. Burton, of Nottingham. They had been prepared 

 specially for illustrating lectures on natural history by means of the 

 magic lantern. 



Dr. M. C. Cooke's paper " The Genus Bavenelia " was read by 

 Mr. Stewart, the figures in illustration being shown upon the black- 

 board (see p. 384). 



Dr. Geo. Hoggan gave a resume of a paper by himself and Mrs. 

 Iloggan, M.D., " On the DcvelojHnent and Retrogression of Blood- 

 vessels," illustrating the chief points in his remarks by drawings on 

 the board as he proceeded. 



Herr A. Grunow's paper " On some New Species ofNitzsclda '" was 

 taken as read (see p. 394). 



Mr. "Webb's paper " On a New Finder " was briefly explained by 

 Mr. Crisp, who thought that generally the idea was a good one, the 

 doubtful points being the cost and the possibility of accurate execu- 

 tion. 



Mr. Curties said that Mr. Webb had recently brouglit the 

 matter to his notice. He believed also that Dr. Royston-Pigot had 

 a similar matter under consideration. 



The following Objects, Apparatus, &c., were exhibited:— 



]\lr. I'xjltuii : — Spawn of percli. 



Mr. Burton : — Phot()gni]ilis ol' ^Microscopical Objects. 



Mr. Crisp: — Spcngcl's Improved Rivet-Loiser Microtome (seo 

 p. 334). 



Dr. Hoggan : — Specimens to illustrate the paper " On the Develop- 

 ment and Retrogression of Jilood-vcsscls. 



(1) Fruvi omentum of ncidy-horn kiltcii. Showing development 



and retrogression of blood-vessels in the same field. 



(2) From mrncvteri/ofrdt (had of old a-jr (lud xtmvatiou. Show- 



2 2 



