54 



Mr. How exhibited in the dark-room, Dr. Maddox's Micro-photographs on a 

 screen 10ft. in diameter, the Oxy hydrogen Polariscope showing Polarization by 

 pressure, Unannealed Glass, Selenite Objects, &c.. Kaleidoscopic efifects and 

 Photographic "Views. In the Museum ten Microscopes, Table Polariscope, 

 Graphoscopes and Achromatic Stereoscopes, with Dr. Maddox's Stereoscopic 

 Micro-photographs. 



Mr. King.— Salmon Hatching, Marine and Fresh Water Aquaria and objects 

 of Natural History. 



Mr. Ladd. — Prisma and spheres of doubly refracting Spar. 



Messrs. Loam and Fearns. — An adjustable rotatory microscope table. 



Messrs. Murray and Heath. — Seven instruments and a collection of objects. 

 Photographs and Stereographs. 



Messrs. Newton. — Fourteen Microscopes, Photographs, and Slides. 



Messrs. PoweU and Lealand. — Three large instruments, and among other 

 objects, the Circulation of the Blood in the tail of a fish, under the patent 

 binocular arrangement for high powers. 



Mr. Thomas Ross. — Six Binocular Microscopes, all of them with his new four- 

 inch objective, showing the follovnng objects:- — Young Salmon (alive) , Diamond 

 Beetle, Ova of Toad, Head of Tiger Beetle, Sheep Tick, Elytron of Diamond 

 Beetle, Haliotis shell section. Trachea of Centipede, Feet of Dytiscus, Elytron 

 of Curculio splendeus, Ciliary process of Eye of Ox, Iridescent oxide of Lead. 



Messrs. Smith and Beck. — Eight instruments ; the Eyeball of Cat showing 

 entrance of Optic Nerve, Eetiua and vessels of the membrane Euyschiana; Tooth 

 of Cat injected, (unique) Acari of Water Eat. Human skin showing hair bulbs. 

 Eggs and Parasite of HombiU, &c. 



Mr. Solomon. — The enlargement of the figures of microscopic objects and 

 micro-photographs by the Magnesium Light. 



Mr. J. H. Steward. — Ten microscopes; Circulation of the Blood in a frog's 

 foot with a binocular under an inch and with Kelner's eye-pieces, giving a field 

 of 18 inches; Parasites, Seaweeds, Spicules, Hairs, Crystals, and selections of 

 Diatoms. 



Mr. Wheeler. — A large collection of mounted objects. 



