MKDICAL MICROSCOPICAL SOCIETY. 207 



The President then delivered his address, after which votes of 

 thanks were accorded to the various officers, and the proceedings 

 terminated. 



At the eleventh ordinary meeting of this Society, held on Friday, 

 February 20th, Jabez Hogg, Esq., President in, the chair, the 

 minutes of the previous meeting were read and confirmed. The 

 names of those gentlemen for proposal were read, and three other 

 gentlemen were duly elected members. 



In the unavoidable absence of the Secretaries, the Treasurer, 

 Mr. T. C. White, read a communication from Mr. J. W. Groves, 

 " On cataloguing and arranging microscopical specimens," which will 

 be published in the next number of this Journal. 



A vote of tlianks having been passed ; the President said he 

 thought the method proposed would supersede all others in use at 

 the present time. 



Mr. Needham endorsed these remarks, and said he had been in 

 the habit of classifying his slides in physiological series, thus — 

 respiratory, digestive, &c., but this system had one great objection 

 which Mr. Groves's obviated, viz. — that one slide might deserve to 

 be placed in several series but could not be, and, consequently there 

 was a great multiplication of specimens, and some difficulty often 

 in finding any particular preparation. 



Mr. Giles, Dr. Matthews, Dr. Donkin, and Mr. R. P. Miller also 

 joined in the discussion. 



Mr. Sidney Copeland then made some remarks on prepara- 

 tions of " Tuberculosis of the Choroid" in a child set. 8 years. 

 After desci'ibing the normal structures, and stating that he in- 

 tended to confine himself wholly to the histological characters, 

 he said — That on removing the retina the tubercles were 

 seen as translucent bodies, averaging ^^" in diameter, the 

 centres of which were mostly white and opaque from degenerative 

 causes. The chorio-ca})illaries could be traced partially over the 

 tubercles. There was a marked deficiency of pigment and a notable 

 increase in the number of the large pale spheroidal bodies. The 

 tubercles were composed of nucleated cells xjUo" *° ■JoW ^° ^'" 

 araeter, and with these were seen some larger and variously shaped 

 cells, having more than one nucleus, some of which were possibly 

 derived from the normal pale spheroidal cells, though these were 

 quite as numerous. 



The tubercles appeared to arise from the middle layer of the 

 choroid and always around the vessels. In the older tubercles the 

 central portions were made up of semifibrous and caseous material, 

 the peripheral only exhibiting the small cell growth. From this 

 distribution it was evident that the growth was perivascular, and 

 this had probably arisen from a proliferation of the lymphatic 

 endothelia, as in tubercles of the pia mater. 



