PEOCEEDINGS OF SOCIETIES. 41 



Quimby. A small tank seut by Lord S. G. Osborne on September 15, 

 apparently quite dry, in which state it had been kept until the morn- 

 ing of the meeting, when it was filled with water, and found to con- 

 tain a large colony of Philodina roseola, which almost immediately 

 became very lively. 



Mr. W. N. Hartley, of King's College : Potassio-calcium chromic 

 oxalate. A remarkable example of pleochroism. Though of a reddish 

 violet tint by gaslight, it appears by daylight, or the light of 

 magnesium wire, to be a mixtiu-e of blue and green crystals. The 

 substance transmits rays of ditferent colours through its different 

 crystalline arcs. 



Mr. John E. Emary: A new revolving amplifier. This ap- 

 paratus consists of a metal disk, containing a series of plano- 

 concave lenses, of different foci, which is made to revolve, so as to 

 bring the centre of each lens within the centre of the body. The 

 lenses have the effect of greatly increasing the magnifying power, at 

 the same time that they give a gi'eater working distance between the 

 object-glass and the object, and do not strain the eye like deep eye- 

 pieces. The lenses can be changed and different powers obtained 

 with the utmost facility. 



Mr. W. A. Bevington : Head of Tcenia denticulata ; and a Stephen- 

 son binocular microscope. 



Mr. John Browning : Precious opal ; shell of insect's egg from 

 Uruguay ; and his new rotating bar microscope. 



Mr. Thos. Curties : Sections of jaw-bone of cat and rabbit, with 

 teeth in situ (injected). 



Mr. Hailes : Foraminifera. 



Messrs. How : Micrasterias denticulata ; and a Lepralia. 



Mr. W. T. Loy : Bombyx mori (larva), dissected, and showing the 

 arrangement of the cutaneous muscles, nervous ganglia, dorsal vessel, 

 and trachea. 



Mr. S. J. Mclntire : Eye of dragon-fly (Libellula), opaque, showing 

 the arrangement of the pigment cells, which cause the beautiful blue 

 tint seen in the eye. These cells are immediately below the cornea. 



Mr. William Moginie : Travelling binocular microscope, ova of 

 toad, and palate of trochus, &c. 



Mr. Walter W. Eeeves : The fly-mould, Saprolegniafei-ax, and the 

 imperfect terrestrial condition of the fungus, kindly supplied by Mr. 

 James Eenny. 



Mr. E. Richards : Eoyal star coral (Balanophyllia regia), alive, with 

 protecting cap on the objective. 



Messrs. Eoss : Heliopelta, and scale of Podura, showing broken 

 ribs, with their ^V^h objective. 



Mr. Charles Stewart : Eespiratory apparatus of Ascidian young 

 feather-star (Antedon) ; and young Echinus miliaris. 



Mr. Amos Topping : A very beautiful section through both eyes of 

 a dragon-fly (^Libellula). 



Mr. F. H. Ward : Crystallization at various temperatures of mixed 

 sulphates of copper, iron, zinc, and magnesia. 



Mr. T. C. White : Parasite of sole (Caligus). 



Mr. Edward Wright : An electro-magnetic turn-table. 



