47 



quantity of chlorate and of chloride of calcium from the 

 previous solution made in the same vessel. 



No. 3. Solution of chlorate of lime of about T15 specific 

 gravity, containing at the same time calcium chloride in the 

 molecular proportion of about 1'5. Obtained by saturating milk 

 of lime with chlorine gas. Towards the end of the process the 

 temperature rises, when permanganate of lime is formed owing 

 to the small quantity of manganese contained in the lime, by 

 which the liquor obtains its pink colour. Oiie litre contains 

 45-48 grammes of chlorate of lime. 



No. 4. First mother liquor of chlorate of potash, of about 

 1*3 specific gravity. The solution of chlorate of lime is boiled 

 down with a sufficient quantity of muriate of potash, and allowed 

 to cool and crystallise for 8-10 days, 



No. 5. Last mother liquor of chlorate of potash, of 1'35-1 P 40 

 specific gravity. The first mother liquor is boiled down still 

 further, and allowed to cool and crystallise again for 8-10 days. 

 It contains 30-40 grammes of chlorate of potash, about 520 

 grammes cf calcium chloride, and 3-5 grammes potassium 

 chloride in the litre. 



No. 6. First crystals of chlorate of potash, containing about 

 85 per cent, chlorate of potash, and 3-4 per cent, calcium 

 chloride. 



No. 7. . Finished crystals of chlorate of potash, containing 

 about 0-0502 per cent, calcium chloride. 



No. 8. Finished ground chlorate of potash, containing about 

 0'022 per cent, calcium chloride, and about 0*125 per cent, 

 moisture. 



155. Crystals of chlorate of potash with specimens 

 showing iridescence. 



1888. Exhibited by Widnes Alkali Go. 



156. Nitre cake, obtained in the manufacture of 

 sulphuric acid by decomposing sodium nitrate with sul- 

 phuric acid. It is composed of sodium sulphate, together 

 with small quantities of sulphate of iron, lime, and 

 magnesia, of sodium chloride, undecomposed sodium 

 nitrate, and free sulphuric acid. 



1876. Exhibited by James Muspratt fy Sons. 



157. Specimens illustrating the manufacture of the 

 bichromates of potash and soda. Chrome compounds. 



1888. Exhibited by John and James White. 



Patent pure bichromate of soda (2). 

 Patent bichromate of ammonia (2). 

 Chromic acid. 



Sesqui-chloride of chromium (2). 

 Chloro-chroinate of ammonia. 



D 2 



