PLATE 3 



EXPLANATION OF FIGURES 



7 Total preparation: Bone marrow of a full-grown, well-fed chicken after 

 thirty hours' incubation at 38°C. in the plasma medium. January 3 to January 

 4, 1916. Orth's fluid, Giemsa stain. (Compare for explanation pages 89 and 

 98-100.) Actual field represented. 



112 



