45 



tological specimens could be safely mounted. Phosphorus was troublesome, 

 and not very satisfactory for the purpose, but if they could lind some suit- 

 able flnid which had an equally high refractive index, it would be of great 

 value. Mr. Stephenson had, amongst other objects, mounted a Podura 

 scale in phosphorus, and found that the effect produced was an inversion of 

 its usual appearance in air. 



Mr. Julien Deby said he had mounted a good many objects in mono- 

 bromide of napthaline, and could say from experience that it was of no 

 good whatever except in connection with homogeneous immersion lenses. He 

 could not, however, recommend it even for them. 



Mr. Ingpen said there were two distinct points to be borne in mind in 

 mounting objects in these substances, one being that they enabled the whole 

 of the large apertures of the oil -immersion lenses to be employed, and the 

 other that they increased the visibility of the objects themselves. 



The President said the members would no doubt be glad to hear that they 

 were favoured by the presence of their distinguished honorary member, 

 Mr. Kitton, of Norwich, to whom they would, he was sure, accord a hearty 

 welcome. 



Mr. Kitton acknowledged the compliment paid to him by the President, 

 and expressed the pleasure he felt at being present on that occasion. 



The thanks of the meeting were voted to those gentlemen who had 

 favoured them with communications, and the proceedings terminated with 

 the usual Conversazione, at which the following objects were exhibited : — 



Rectal papillae of Earwig, Flea, and Blow-fly... The President. 



Section of Coral with For aminif era, polarized Mr. F. W. Andrew. 



Fructification in Plocamium coccinium ... Mr. W. G. Cocks. 



Pleurosigmob jormosum and P. fasciola,} m * T C f" 

 mounted in phosphorus ... ... J 



Objects exhibited by Monochromatic Light ... Mr. Julien Deby. 



An old Microscope,'by E. Culpepper, circa 1750 Mr. H. Epps. 



Section of Shell of Brazil-nut ... ... ,, 



Stem of White Water-lily, stained ... ... Mr. W. Goodwin. 



"The Ginger-beer Plant"... ... ... Mr. J. D. Hardy. 



Pleurosigma attenuatuw, mounted in mono- 

 bromide of napthaline ... 



Various vegetable sections ... ... Dr. Matthews. 



Wing of Tabanus bovinus, &c. ... ... Mr. T. S. Morten. 



Section of Ovule of Ulmus ... ... Mr. J. W. Reed. 



Larva of Corixa ... ... ... Mr. F. Wood. 



Attendance— Members, 79 ; Visitors, 10. 



"| Mr. J. E. Ingpen. 



