130 DEUTERO-ALBUMOSE. [BOOK II. 



Deutero-albumose is not precipitated from its solutions by satura- 

 tion with sodium chloride. 



Even when its solutions are saturated with NaCl and boiled no 

 precipitation occurs. 



Solutions in pure water are not precipitated by boiling, even 

 after being acidulated with acetic acid. Nitric acid produces neither 

 turbidity nor precipitate ; when added in slight excess the liquid 

 becomes yellow, even in the cold. If, however, sodium chloride be 

 added in sufficient quantity to this yellow liquid it becomes turbid, 

 but when heated, long before it reaches the boiling-point, it becomes 

 clear ; on cooling, however, the solution becomes as opaque as 

 before. 



When solutions of deutero-albumose are rendered feebly acid by 

 means of acetic acid, and then a few drops of a solution of NaCl 

 added, they may remain perfectly clear ; on then gently heating, a 

 turbidity often becomes visible, to disappear when the temperature 

 rises, and to reappear permanently on cooling, after which the liquid 

 must be heated almost to boiling-point in order to clear it. 



If the quantity of NaCl added be gradually increased, however, it 

 will be found that on boiling the solution, the precipitate almost, but 

 never quite, disappears on boiling. If the liquid be filtered, how- 

 ever, it will be found, that though it at first passes through the filter 

 perfectly clear, it at once commences to precipitate, in consequence 

 of the sudden, though slight, fall in temperature. If acetic acid be 

 added, however, to a cold NaCl solution, in which a precipitate had 

 been caused, in quantity sufficient to dissolve the precipitated deu- 

 tero-albumose, no further precipitation will be caused, though the 

 liquid be again boiled. 



When heated with lead acetate and sodium hydrate, deutero- 

 albumose darkens intensely. To acetic acid and potassium ferro- 

 cyanide, as well as to solutions of neutral and basic lead acetate, 

 copper sulphate, and mercuric chloride, deutero-albumose behaves 

 precisely as proto-albumose. 



Like all the albumoses it is precipitated completely from its solu- 

 tions when these are saturated with neutral ammonium sulphate. 



Deutero-albumose gives with copper sulphate and sodium hydrate, 

 the rose colour which constitutes the biuret reaction. 



Deutero-albumose is laevogyrous. The specific rotation of the 

 preparation was found by Kiihne and Chittenden to be (1) (a) D = 

 - 74H1, and (2) (a) D =- 7911. 



The following numbers exhibit the composition of deutero- 

 albumose : 



Carbon 50'84 



Hydrogen 6 '85 



Nitrogen 1714 



Sulphur 1-07 



Oxygen 2410 



