FIG. XXIV. Various stages in the life-cycle of Entamoeba tetragena. 

 (After Viereck.) 1, vegetative form ; 2 and 3, forms showing division of the 

 nucleus; 4 to 12, stages in nuclear reduction and development. Note the 

 large amount of chromatm during some of the stages. Figs. 11 and 12 are 

 encysted forms. 



