BLOOD 71 



Heat a little serum and test for proteid. Can the proteid 

 present be fibrin? Reasons? What use is made of the 

 foods present in serum? How do they get into the serum? 

 (See Ex. XXX.) What is one function of the blood? 



D. Study of Defibrinated Blood. Examine the contents 

 of Bottle 7. How does this blood differ from fresh blood? 

 from serum? 



Place some of this blood in the dialyzer. Fill the outer 

 jar with distilled water. Does the color of the water in the 

 outer jar change? After a time test the water in the outer 

 jar for proteid, grape sugar, minerals. What part of the 

 blood dialyzes? 



Fill a bottle half full of defibrinated blood and shake it 

 vigorously. Does it change in color? What was mixed 

 with the blood by shaking the bottle? (One function of the 

 colored corpuscles is to take up oxygen. This function, 

 which heightens their color, is due to the iron they contain; 

 see Ex. VI.) Look up in your text the use of the white 

 corpuscles. 



