23 G PROCEEDINGS OF SOCIETIES. 



Didymium glass ; piece of Erbium glass ; jargoon, for bands ; ditto 

 heated and not heated, for bands ; Turacus feather, for bands. 



Mr. W. T. Loy : A series of slides illustrating the anatomy of 

 Asojms luridiis. 



Mr. S. J. Mclntire : Obisium ortliodactylum. She has spun a web 

 round herself in order to be protected whilst the young are brought 

 forth alive. 



Mr. Thomas Palmer : Batrachospermum moniliforme, mounted in 

 balsam. 



Dr. Eoyston-Pigott : New micro-refractometer for finding refrac- 

 tive index of lenses or plates of glass for mean rays ; also as a linear 

 micrometer. 



Eoyal Microscopical Society : The microscope, &c., recently 

 presented to the Society by Mr. Charles Woodward. 



Mr. W. W. Keeves : Syzygites megalocarpus, the very curious con- 

 jugating fungus. 



Mr. E. Eichards : Hydradinia, exhibited with immersion tube in 

 marine aquarium. 



Mr. Charles Stewart : Two slides of a heterapod Firoloides ; one 

 showing pedal ganglia and nerves, the other cerebral ganglia, eyes 

 and ear-sac, &c. 



Mr. Swift : His improved portable microscope ; Captain Perry's 

 new method of converting the Eoss model microscope into the Jackson, 

 Lister, or crane-arm form ; and his new achromatic condenser, which 

 answers the purpose of nearly every piece of sub-stage apparatus. 



Mr. James Smith : Leaf of Salvia, showing oil-glands. 



Mr. H. J. Slack : Silica films and beads deposited by hydrofluo 

 silicic acid gas in glycerine and water. The process and description 

 of these curious objects will be described very shortly to the Society. 



Mr. Suffolk : Head of gnat in glycerine. 



Mr. Amos Topping : Section of liver, stomach, and small intestine 

 of eel ; injected fin and gall-bladder of ditto. 



Mr. Varley : His father's lever microscope, his vial microscope, 

 diamond lens, and diagrams of Gliara vulgaris, &c. 



Mr. F. H. Ward : Scales of Lepisma ; a new British sjiecies,. show- 

 ing parallel and radiating markings on the opposite sides of the scale. 



Mr. E. Wheeler : Atdacodiscus sollittanus, A. symmetricus, A. 

 Kittonii, and other rare diatorps. 



Donations to the Library and Cabinet since March 4, 1874 : — 



From 



Nature. Weekly The Editor. 



Athenseum. Weekly Ditto. 



Society of Arts Journal. Weekly Society. 



On the Geometrical Isomorphism of Crystals, &c. By 



Rev. W. Mitchell, M.A Victoria Institute. 



Transactions of tlie Northumberland and Durham Natural 



History Society. Vol. V. Part I Society. 



One Slide S. J. Mc/ntire, Esq. 



Herbert Horn, Esq., was elected a Fellow of the Society. 



Walter W. Eeeves, 



A ^sist. Secretary. 



