24 THE BIOLOGY OF THE CELL 



dant or few in number ? What is their shape as 

 seen from the side 1 From the edge ? What is 

 the color ? To what is due the color of the blood 

 as a mass ? Does the cell have a nucleus ? If so, 

 what is its position ? Does it always have this 

 position? What is the shape of the nucleus? 

 Structure? Has the corpuscle a wall? Is the 

 cell flexible or rigid? Does the red cell bear 

 any resemblance to Protozoa ? 

 Make drawings of red corpuscles as seen in different 

 positions, showing both shape and structure. 



5. The colorless cells or "-white" corpuscles. — 



What is their shape ? Color ? Size as compared 

 with the red and with one another ? Is there a 

 cell-wall ? A nucleus ? How do these corpuscles 

 compare in number with the red? Study this 

 last point again by taking a drop of blood from 

 the cut edge of a muscle half an hour after the 

 incision was first made. Do you find any dififer- 

 enee in the number of " white " corpuscles pres- 

 ent ? Compare the structure of one of these cells 

 with that of Amc^ba. What resemblances and 

 differences do you find ? 

 Make drawings showing the shape and structure of 

 " white " corpuscles. 



Kun a drop of one per cent, acetic acid under the 

 cover-glass. How does the acid affect the internal parts 

 of each kind of corpuscle? What changes are noticed 

 in the color and shape of each ? With a fresh prepara- 

 tion run a drop of a strong aqueous solution of magenta 

 under the cover-glass, and note the effect. Run in a 

 drop of distilled water in a fresh preparation. What 

 becomes of the coloring matter of the red corpuscles ? 



