XXIII] 



DEVELOPMENTAL CYCLE 



Fig. 87. Developmental cycle of H&moproteus columbce. la and ib, young 

 halteridia in the blood corpuscles ; I a to 40 and ib to 46, stages in the 

 growth of the female and male gametocytes, respectively ; $a, female 

 gamete ; 56, formation of male gametes ; 6, fertilization ; 7, zygote ; 

 8 to 12, stages in the extrusion of granules from the ookinete ; 13, youngest 

 stage in a leucocyte from the lung of a pigeon ; 14 to 20, stages in its 

 multiplication, accompanied by hypertrophy of the leucocyte ; 20, the 

 liberation of large numbers of uninucleate forms which enter the red cells 

 and there become the young halteridia. (After Aragao.) 



