234 



THE BLOOD AND ITS CIRCULATION 



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 

 /^0>\\ ( wn it e ) corpuscles as well? How do they 



if If;' j) compare with the red in number? 



U \«t tdU *>r Conclusion. — How does the structure of 



Corpuscle of Man. 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 



Apparatus for Generation of Carbon Dioxide and Oxygen, 

 A, acid ; M , marble. 



