Apparatus for the electrolysis, of water and of hydrochloric 

 acid ; stand ; pair of platinum and of carbon poles. 

 Apparatus for generating ozone. 



Blocks (8) to illustrate combination in multiple proportions. 

 Apparatus for preparing nitric peroxide from air. 

 Clay tobacco pipe with long stem. 



131. Lecture diagrams prepared for use in the Chemical 

 Laboratory, Royal College of Science, South Ken- 

 sington. 



1887. 



Troost and Deville's vapour density apparatus. 



The safety lamp. 



Manufacture of carbon bisulphide, Girard's process. 



Preparation of iodine. 



Mode of extracting sulphur in Sicily. 



Sulphur refinery. 



Manufacture of fuming oil of vitriol. 



Concentration of sulphuric acid (3 diagrams). 



Manufacture of boric acid in Tuscany. 



Manufacture of boracic acid. 



Salterns. 



Concentration of brine. 



Manufacture of potassium. 



Stalactites and stalagmites. 



Distillation of mercury. 



Manufacture of mercury, Alberti furnace. 



Liquefaction of oxygen, Cailletet's apparatus (2 diagrams). 



Liquefaction of oxygen, Pictet's apparatus (3 diagrams). 



Liquefaction of carbonic acid, DeleuiFs apparatus. 



Lavoisier and Laplace's calorimeter. 



Lothar Meyer's curve of the elements. 



Periodic system of the elements. 



Composition of gunpowder. 



Composition and illuminating power of the coal and cannel 

 gases used in different towns. 



Dumas' and Stas's method of determining the atomic weight 

 of carbon. 



132. Johnston's Illustrations of Chemistry, Sheet No.l. 

 " Elementary bodies with their symbols, atomic 



weights, and their quanti valence." 



1888. Exhibited by W. and A. K. Johnston. 



133. Johnston's Standard Series of School Diagrams, 

 No.l. 



" Chemical apparatus." 



1883. Exhibited by A. Johnston. 



