534 SEC. 13, CHEMISTRY. 



2698. Salt Cake, or sulphate of soda containing 99 per cent, 

 of real sulphate, made without the use of sulphuric acid by 

 the " Hargreaves " direct action process. Salt maintained at a 

 red heat in iron cylinders is exposed to the direct action of sul- 

 phurous acid, air, and steam. The hydrochloric acid from the 

 salt is condensed as in the ordinary process. 



Sullivan fy Co., Lancashire. 



2699. Native Peroxide of Manganese (Spanish), con- 

 taining 80 per cent, of peroxide. 



N. Mathieson 8? Co., Lancashire. 



2700. Hydrochloric Acid, obtained by absorbing the gaseous 

 acid in water. JV. Mathieson fy Co., Lancashire. 



2701. Chloride of Manganese from native "manganese" 

 stills after neutralization with carbonate of lime. 



N. Mathieson fy Co., Lancashire. 



2702. Limestone Dust. Crushed carbonate of lime. 



N. Mathieson fy Co., Lancashire. 



2703. Manganese Mud, as precipitated before blowing with 

 air. JV. Mathieson fy Co., Lancashire. 



2704. Manganese Mud, after oxidation by blowing. 



N. Mathieson fy Co., Lancashire. 



2705. Burnt Lime, from Buxton, Derbyshire. This lime is 

 unslaked. N. Mathieson fy Co., Lancashire. 



2706. Hydrate of Lime, sifted and ready for the bleaching 

 powder chambers. JV. Mathieson $ Co., Lancashire. 



2707. Bleaching Powder, containing 38 per cent, of chlorine. 



N. Mathieson fy Co., Lancashire. 



2708. Mother Liquor. When the crystallization of the soda 

 is complete, the remaining liquid, or 6t mother liquor," is run off. 

 This contains nearly all the soluble impurities in the " soda ash." 



Gaskell, Deacon, fy Co., Lancashire. 



2709. Refined Alkali. To obtain this, soda ash is dissolved 

 in hot water, the clear solution is evaporated, when a mono- 

 hydrated carbonate of soda is precipitated, which is then calcined 

 and ground. Gaskell, Deacon, fy Co., Lancashire. 



2710. Red Liquor. In some cases the vat liquor is not 

 evaporated to dryness, the residual liquor (called, from its colour^ 

 "red liquor") containing the greater part of the caustic soda 

 sodium chloride, sulphate, sulphites, sulphide, and other impurities* 



