222 CONJUGATED ACIDS. 



Inosate of copper forms a light blue, amorphous powder, 

 insoluble even in acetic acid, 



Inosate of silver is amorphous, white, and slightly soluble in 

 pure water. 



Preparation. If the mother-liquid of the juice of flesh, after the 

 creatine has crystallised and been removed, (see p. 136,) be gradu- 

 ally treated with alcohol till the whole become milky, it deposits^ 

 in the course of a few days, yellow or white granular, foliated, or 

 acicular crystals of the inosates of potash and baryta, mixed with 

 creatine. Chloride of barium must be added to the hot aqueous 

 solution of these crystals ; on cooling there is a deposition of crys- 

 tals of inosate of baryta, which, by recrystallisation, are rendered 

 perfectly pure. By decomposing this salt with sulphuric acid, or 

 the copper-salt with sulphuretted hydrogen, the acid is obtained in 

 a state of purity. 



Tests. So little is yet known regarding the properties of this 

 acid, that the only test we can rely upon is the ultimate analysis. 



Physiological Relations. 



Liebig has hitherto only found this acid in the fluid of flesh. 

 The few facts which we at present possess regarding this acid 

 throw no light on its mode of formation. From the great quan- 

 tity of oxygen which it contains, it must be regarded as a product 

 of the decomposition of effete tissues. 



GLYCOCHOLIC ACID. C 52 H 42 NO n .HO. 



Chemical Relations. 



Properties. This acid, which has been named, par excellence., 

 bilic or cholic acid, forms extremely delicate needles, which 

 remain unchanged at 136; it has a bitterish-sweet taste, dissolves 

 in 120*5 parts of hot, and 303 parts of cold water ; is readily soluble 

 in spirit, but only slightly in ether; it does not crystallise on 

 evaporating the alcoholic solution, but separates as a resinous mass ; 

 but it crystallises from the spirituous solution, mixed with water 

 and exposed in the air to gradual evaporation. The aqueous solu- 

 tion of this acid reddens litmus strongly. It dissolves without 

 change in concentrated acetic acid, cold sulphuric acid, and hydro- 

 chloric acid. 



The aqueous solution of this acid is not precipitated by acids, 

 neutral acetate of lead, corrosive sublimate, or nitrate of silver ; 



