134 THE BLOOD 



Heat it in a test tube and note change. 



Apply Xantho-proteic test. 



4) Place a small quantity of whipped blood on a piece of 

 platinum foil. Heat in alcohol or gas flame and note that after 

 the drop dries it blackens, showing that it contains much 

 organic matter. 



Continue heating until this is burned away; examine residue 

 of white ash, consisting of mineral constituents of blood. 



