234 



THE BLOOD AND ITS CIRCULATION 



Corpuscle op Man. 



b. In Man 



Observations. — Using a slide of your own blood, note that red 



corpuscles have no nucleus. (They do when they are young.) 



Are they cells? Do you .find colorless 



(white) corpuscles as well? How do they 



compare with the red in number? 



Conclusion. — How does the structure of 

 blood corpuscles in man compare with those 

 of the frog ? 

 The following experiment will show one of the functions of 

 corpuscles. 



Problem 200 : To determine the effect of oxygen and carbon 

 dioxide upon the blood. 



Materials. — Test tubes, defibrinated blood, calcium carbonate, 

 hydrochloric acid, oxone. 



Method. — Using two tubes of defibrinated blood, lead a tube 

 from a bottle containing calcium carbonate and hydrochloric acid 

 into one tube. This will produce carbon dioxide gas. Lead a 



o 



fr 



Bi,o 





or» 



Oxyg€ 



Oenerator" 



Appaeatcs fob Generation of Carbon Dioxide and Oxygen. 

 A, acid ; JW, marble. 



