434 ALBUMINOUS COMPOUNDS. 



taut liquid or filter it ; throw the precipitate, still moist with 

 acid, into water, and it will dissolve 1 . Tins is not a solution in 

 water, but in dilute acid, for a considerable quantity of acid 

 still remains in the precipitate. Fgg albumin ditl'ers from 

 serum albumin in its behavior with acids, and this, and its 

 eoauu lability by ether, form the chief distinctions between 

 them. 



Kepeat the last experiment with egg albumin. It will not 

 dissolve so readily in nitric or hydrochloric acid, and when 

 precipitated by dilution will dissolve slowly and imperfectly 

 in more water, instead of doing so readily, like serum albumin. 



The precipitate from hydrochloric acid will be brittle and 

 fibrous if the solution has been recently made, but if the solu- 

 tion is boiled until it begins to become violet, or allowed to 

 stand for some days, the precipitate will be lloeculent and 

 soluble, like that of serum albumin. 



* 19. Preparation of Syntonin. (a.) From serum or 

 ..Ibnmin. Neulrali/.e the solution in dilute acid, obtained 

 in la-t experiment, with dilute liquor potass;e ; a gelatinous 

 tlocciilent precipitate of [Mire .syntonin will fall. 



(l>.) From lil rin. Dissolve it in concentrated hydrochloric 

 acid: filter the solution if necessary, and then proceed as with 

 serum albumin. 



(r.) From muscle. Mince some muscle, wash it with water, 

 add to it a considerable quantity of dilute hydrochloric acid 

 (four cubic centimetres of strong acid to one litre of water), 

 and let it stand for several hours, stirring it frequent ly. Fil- 

 ter it through a plaited filter. Dilute the filtrate with water, 

 neutrali/e it with a solution of sodium carbonate, and wash 

 the precipitate with water. 



20. Characters. When freshly precipitated, syntonin 

 forms a st icky jelly, but it is not tenacious. 



No////;//////. It is insoluble in water, and in dilute Nad 

 solution. It is readily soluble in lime water, in dilute hydro- 

 chloric acid, and weak alkaline solutions. It is not soluble in 

 a solution of six parts of potassium nitrate in 1(M of water. 



Its solutions behave like those made by heating albuminous 

 solut ions with dilute acids. 



21. Tests. Dissolve some syntonin in lime-water and boil 

 it. Coagulation will occur. 



Add magnesium sulphate or calcium chloride to a cold alka- 

 line solution of syntonin. Fnlike alkali albuminate, it will 

 not b<- precipitated, lloil tin- solution, and precipitation will 

 occur. 



l>oil an alkaline solution of syntonin, and then add magne- 

 sium sulphate or calcium chloride, ami a precipitate will fall 

 e. This would seem to be due to the syntoniu being 

 converted into alkali albuminate by boiling. 



