and Caspian Seas. 105 



are, therefore, inferior to those of the Elton Sea. Rose 

 has appropriated all the sulphuric acid to the magnesia, 

 because he has found that when common salt and Epsom 

 salt are dissolved in a sufficient quantity of water and eva- 

 porated in a summer heat, the two salts separate ; and when 

 much common salt is dissolved along with a small quantity 

 of Epsom salt, apart of the common salt separates first, and 

 then the Epsom salt, while common salt remains in solu- 

 tion ; as by the heat of summer, Epsom salt is less soluble 

 than common salt. When the temperature is raised above 

 122° F., or sunk to zero, in both cases, glauber salt and 

 chloride of magnesium are formed. 



Rose found the specific gravity of water brought from 

 the Caspian sea 75 versts from the islands formed by the 

 Volga, at 54|°, 1-0013; and its contents, 



Chloride of sodium, -754 



Sulphate of soda, • . . *036 



Sulphate of lime, ......... -406 



Bicarbonate of lime, -018 



Bicarbonate of magnesia, - 440 



Water with a small quantity of organic matter, 998-346 



1000-000 



Article IV. 



The Action of Isinglass in clearing Malt Liquor explained. 

 By Mr. Samuel Roberts. 



In explaining the action of Isinglass in clearing malt liquor, 

 two subjects present themselves for particular consideration. 



The first is the nature and properties of Isinglass. The 

 second is the change which takes place in malt liquor during 

 the process of fermentation. 



The best Isinglass is obtained from the sounds of the fish 

 of the genus Accipenser, especially from the Sturgeon, found 

 in the Danube, and the rivers of Muscovy. It is also obtained 

 from the sounds of the Beluga, and Huso Germanorum.* 



Isinglass is almost entirely gelatine, 98 parts in every 100 

 of good isinglass being soluble in boiling water. 



• Very pure Isinglass is also procured from the American fish, Gadus merluccius. 

 The long stripes of Isinglass met with in commerce, are from the Gadui morrhua. 

 See Records, vol. i. 239. — Edit. 



