82 PROCEEDINGS OF SOCIETIES. 
November 17th, 1862. 
J. G. Lynpsz, F.G.S., M. Inst. C.E., in the Chair. 
Captain Randall, late of the barque “Brazil,” forwarded eight 
soundings taken on the north coast of the Brazils. 
Mr. Thos. Heelis presented a specimen of the Hcheneis Remora, 
or sucking fish. 
Mr. Parry presented a number of cells and rings in cardboard ; 
they were very smooth, and sharply cut, without the bur usually 
produced by punching out cells. Mr. Parry explained that he had 
cut them in the lathe twenty or thirty together, the outside cuttings 
only presenting an appreciable bur. 
Dr. Roberts called attention to the aid that might be received in 
the examination of the structure of animal and vegetable tissue by 
the use of colouring materials. Magenta is peculiarly adapted for 
this purpose, in consequence of its solubility in simple water and its 
inert chemical character. The nuclear structures of animal cells 
are deeply tinted by magenta, and by its use the nuclei of the pale 
blood-corpuscles, of pus-globules, of the renal and hepatic cells, of 
cancerous growths, and of all epithelial structures are brought out 
in great beauty, tinted of a bright carbuncle red. The red blood- 
disks are tinted of a faint rose-colour and a darker red speck, not 
hitherto noticed, is to be observed on the periphery of the corpuscle ; 
it undergoes some changes when treated with tannin, and, subse- 
quently, with cauistic potash; but this point is still under investi- 
gation. , 
Dr. Roberts exhibited mounted specimens to illustrate his views. 
Mr. John Leigh, M.R.C.S., exhibited a case of microscopical dis- 
secting instruments, by Wood, of Manchester, which were highly 
approved of for completeness and finish. 
Mr. Thos. H. Nevill exhibited, with dark ground illumination, 
some fine specimens of Conochilus Volvox. 
