DUBLIN MICROSCOPICAL CLUB. 421 



fibrin of blood-clot coincidentally with the growth onwards of the 

 epithelium, the granulation-cells disappearing in great numbers at 

 the same time. He had never yet been able to find the granulation- 

 cells becoming developed into epithelium, but he had seen a few 

 of them lying beeween the cells of the epidermis. The granulation- 

 tissue beneath the earliest formed epithelium was the first to become 

 developed into fibrous tissue. 



Mr. Coupland thought the disappearance to the naked eye at 

 times of a graft, and the subsequent growth of epidermis at the 

 spot grafted some time after, was a proof of the development of 

 epithelium from granulations. 



Mr. Schafer referred to the observed transformation of white 

 blood-corpuscles on the recently blistered surface in the frog. 



Mr. Golding Bird, in reply, denied that a graft that reappeared 

 as stated had ever in reality disappeared. He believed that the 

 deepest layer of epithelial cells was always left, though not visible to 

 the naked eye. 



Pacinian Corpuscles. — Mr. Schafer gave an account of these 

 bodies, discussing generally the various opinions held regarding 

 them. He explained their several component parts, and held that 

 the " core" was the layer of protoplasm described by Ranvier as 

 covering the medullary sheath of the nerves. He had seen a nerve 

 pass from one Pacinian body to another. 



Dr. Pritchard asked if the Pacinian bodies in the cat's mesentery 

 were the same as in the skin. 



In reply Mr. Schafer stated he considered them identical. 



Mycetoma. — Microscopic specimens of the " Fungous Foot of 

 India" were exhibited by the President. 



Dublin Mioboscopioal Club. 

 2Zrd April, 1874. 



An Apparatus for Collecting Dust Particles. — Dr. J. Barker 

 showed an apparatus he had devised and constructed, intended to 

 obtain " dust samples" from the air, having modified for the purpose 

 a " fan-bellows," to cause a draught inwards by means of the fanners 

 through a wide lateral tube, within which were fixed a number of 

 grooves to receive a few slips of glass moistened with glycerine. 

 These were, of course, removable for examination for spores, &c., 

 under the microscope. By bringing this apparatus into use upon 

 heights, &c., samples of the particles carried by the atmosphere 

 could be obtained. 



Nucleus of Ovule of WeltoitscUa. — Dr. McNab exhibited a 

 preparation of the apex of the naked nucleus of the ovule of Wel- 

 witschia, to which numerous pollen-grains with the pollen-tubes 



