MISCELLANEOUS. 869 



4204. Galvanic Cell, for potassium bichromate. 



Royal Prussian Chief Mining Department ', Breslau. 



4205. Electro-Magnet, with anchor and stand. 



Royal Prussian Chief Mining Department, Breslau. 



4206. Electrophor, with cover and glass rod. 



Royal Prussian Chief Mining Department , Breslau. 



4207. Small Induction Apparatus. 



Royal Prussian Chief Mining Department, Breslau. 



4208. Small Slectro-Magnetical Keyboard and 



Chiming- work, with paper-roll and marking pencil ; a primitive 

 telegraph model. 



Royal Prussian Chief Mining Department, Breslau. 



4209. Air-Pump , with oblique barrel. 



Royal Prussian Chief Mining Department, Breslau,. 



4210. Fair of Magdeburg Hemispheres. 



Royal Prussian Chief Mining Department, Breslau. 



4211. Pall Tube. 



Royal Prussian Chief Mining Department, Breslau. 



4212. Two Glass Globes for Air-Fump. 



Royal Prussian Chief Mining Department, Breslau. 



4213. Mercury Granulation Apparatus, with glass cy- 

 linder. Royal Prussian Chief Mining Department, Breslau. 



4214. Heron's Ball, with glass bowl. 



Royal Prussian Chief Mining Department, Breslau. 



4215. Freezing Apparatus, brass stand with glass tubes. 



Royal Prussian Chief Mining Department, Breslau. 



4216. Syphon Apparatus. 



Royal Prussian Chief Mining Department, Breslau. 



4217. Expansion Apparatus. 



Royal Prussian Chief Mining Department, Breslau. 



4218. School Microscope, from the Optical Institute of 

 F. W. Schick, Berlin, with two eye-pieces and three object-glasses. 



Royal Prussian Chief Mining Department, Breslau. 



4219. Collection of Forty Microscopical Preparations 



from the Institute of Rodig, Hamburg, with explanations by Prof. 

 Dr. Ferd. Cohn. 



Royal Prussian Chief Mining Department, Breslau. 

 The collection serves, in connexion with other means of illustration, for 

 the purpose of teaching in the elementary public schools of the Prussian 

 mining districts (particularly Silesia, Posen, and Prussia proper) the rudi- 

 ments of the physical and mechanical sciences, and thus to prepare the 

 children of miners for their probable future employment as miners, engine 

 attendants, &c. It is worthy of remark that the money required for the 



