220 ANIMAL AMIDES. 



ammonia, which has precipitated together with a new portion of 

 albumen. The alcohol is now to be distilled off. What re- 

 mains is hematosin mixed with saline matter, some organic mat- 

 ter and some fat. Let it be successively treated with water, al- 

 cohol, and ether till it has been freed from everything solu- 

 ble in these three liquids. It is now to be digested in alcohol 

 containing about 5 per cent, of liquid ammonia. Filter again, 

 distil off the alcohol, and evaporate the residuum to dryness. 

 Wash what remains with distilled water, and dry it in a gentle 

 heat. It is pure hematosin.* 



Hematosin thus obtained possesses the following properties : 

 It is solid, without taste and smell, and of a dirty brown colour, 

 provided it be obtained by the process above detailed ; but it has 

 the metallic lustre, and a reddish black colour when obtained 

 by evaporating an ammonico-alcoholic solution over the vapour 

 bath. 



It is insoluble in water, alcohol of all strengths, sulphuric 

 ether, acetic ether, whether cold or hot. 



Water, alcohol, and acetic ether, containing a very small quan- 

 tity of caustic ammonia, potash, or soda, dissolve it easily and 

 assume a blood red colour. But these alkalies never loose their 

 alkaline reaction, how great soever the quantity of hematosin may 

 be, which they may have dissolved. 



Oil of turpentine and olive oil dissolve it when assisted by heat. 

 The solution has a fine red colour. 



Alcohol slightly acidulated with sulphuric or muriatic acid 

 dissolves it readily. The solution is brown, but becomes blood- 

 red when the acids are saturated. 



Alcohol of 0*8428, or still better, alcohol of 0-9212, dissolves 

 it when assisted by sulphate of soda. But this salt does not ren- 

 der hematosin soluble in water. 



Water throws it down completely from its acidulated alcoholic 

 solution. The precipitate is pure hematosin, and contains no 

 acid. Water does not precipitate it from its ammoniaco-alco- 

 holic solution. When the solution is much diluted and boiled 

 for a long time, the hematosin is altered. It assumes a green- 

 ish tint, and becomes insoluble in ammoniated alcohol. 



Lecanu at first gave to the colouring matter of blood freed from albumen, 

 the name of globulin. But the observations of Gay Lussac and Serullas induced 

 him to abandon that term and adopt hematosin. 



