MISCELLANEOUS. 1061 



f 1 . Apparatus for proving that at the combination of the respec- 

 tive elementary gases HC1, H 2 O, and NH 3 , always two vol. ga* 

 are formed ; consisting of three y-shaped tubes with platinum 

 electrodes, and three iron stands. 



g. Apparatus for demonstrating that the gases H and Cl com- 

 bine in the constant proportion of 1 : 1 into hydrochloric acid ; con- 

 sisting of a glass tube with stop-cock, and two ground-in stoppers, 

 with stand. 



h. Apparatus for the decomposition of nitric acid ; consisting of 

 a little platinum piston, a stand, a funnel-tube with stop-cock, a 

 pneumatic trough, and a cylinder. 



i. Apparatus for demonstrating the equal volume proportions of 

 simple and compound gases ; consisting of steam apparatus, steam- 

 conducting pipe, glass apparatus with five stop-cocks, and an iron 

 stand. 



k. Apparatus for making experiments with sulphurous acid. 



/. Apparatus for the decomposition of hydrogen phosphide ; 

 consisting of \/-shapcd tule with two electrodes, and a stand. 



m. Apparatus foi showing the capability of oxidisation and 

 reduction of the gas dame ; consisting of a copper crucible, v/ith 

 tripod and gas-burner. 



n. Apparatus for the electrolytical decomposition of the HC1, 

 H 2 O, and NII 3 ; consisting of y-shaped tube with platinum elec- 

 trodes, and iron stands. 



o. Reagent etagere for bottles ; with octagonal stopper, ribbon- 

 label, etched inscription, and formula on the stoppers. 



4501. Apparatus for demonstrating the Valency of 



Atoms, according to Kekule. 



Consisting of a number of differently coloured balls for demonstrating the 

 importance of the elements and the origin of the combination of the elements, 

 on an iron stand. 



4502. a. Cooler of Zinc, after Liebig, on stand. 



4503. b. Cooler of Brass, after Liebig. 



4:504. c. Cooler of Glass, according to Hofmann. 



45O5. a Two Agate Mortars, with pestle, 65, 150 mm, 

 diameter. 



4:506. b. Three Glass Mortars, with pestle, 60, 100, 12O 

 mm. diameter. 



4507. c. Three Powder Mortars, of porcelain, with pestle, 



4508. d. Pill Mortar of Iron, 155 mm. diain, 



4509. e. Diamond Mortar. 



Diamond mortars for facilitating the pulverisation of minerals difficult to 

 triturate, a process absolutely necessary in making quantitative analysis. 



