128 HEMATINE. 



Hair. 1. Notice structure under microscope. 



2. Digest with concentrated warm hydrochloric 

 acid ; it will very slowly dissolve to a violet solution. 



3. Heat with nitric acid, it will turn yellow and in 

 great part dissolve. 



4. Boil with strong caustic potash, it will dissolve. 

 Add to the solution potash-lead acetate, a black pre- 

 cipitate of sulphide will ensue, proving the presence of 

 sulphur. 



5. Heat on platinum foil ; it will burn with an odour 

 of horn and leave a swollen charcoal, and finally about 

 1% of ash containing iron. 



6. Chemolyse by means of sulphuric acid. Leucine, 

 tyrosine, &c., will be obtained. 



Hematine. 1. Dilute one volume of saturated sodium 

 chloride solution with fifteen volumes of water. Add 

 one volume of blood, freed from fibrine by beating and 

 filtered through a cloth. Mix well and allow to stand 

 in ice and water till the corpuscles have settled. 

 Decant the liquid and wash them with the same quan- 

 tity of sodium chloride as before. Repeat this opera- 

 tion a third and fourth time. Shake the corpuscles 

 with water and ether, separate off the ether, and to 

 the red watery solution add basic lead acetate solution 

 in slight excess, filter off the precipitate, and remove 

 excess of lead by a little potassium carbonate. To the 

 filtrate add potassium carbonate in powder till the 

 colouring matter separates, filter off the flakes, press 

 them strongly, break the mass, and exhaust with strong 

 alcohol. To the extract add alcoholic solution of tar- 



