68 



THE LIVING WORLD. 



have not completely separated. There is a small 

 amount of dependence of the cells upon each other ; 



FlG. 5. A Colony of Protozoa. Each cell is independent, a and b show manner 

 of division to form colonies. 



they share each other's food, and all seem to be con- 

 nected by some physiological bond. Still, each is in 

 itself complete individual, having a complete system of 



