PLATE 3 



EXPLANATION OF FIGURES 



16 and 17 Granulocytoblasts with crescent-shaped nuclei, representing the 

 stage which precedes to the granulocytes represented in figures 7, 15, and 18. 



18 Myeloid metaplasis in the connective tissue surrounding an egg-follicle in 

 a pullet, g, degenerated granulocytes. Sections of a vein and an artery (b) are 

 seen in the figure. Slide by Dr. H. D. Goodale. Hemat. eos. 



19 Phagocytic cell found in a granulopoietic focus of the testis of the eight- 

 eenth-day embryo. The cytoplasm shows a faint network, but lacks a conspicu- 

 ous sphere and centrosomes. Hem. eosin. 



20 and 21 Phagocytic cells with engulfed granulocytoblasts in their cyto- 

 plasm; the cell in figure 20 is binucleate. Same material as in preceding figure. 



22 Lymphoid metaplasis in the connective tissue of the regenerating testis 

 of a mature Campine cock. Hem. eos. 



23 to 28 Stages in the transformation of a small lymphocyte (first cell to the 

 left in figure 23) into wandering cells. Figures 27 and 28 represent the large 

 wandering cells thus produced, described by several authors under the names of 

 Leydig cells and interstitial cells. Testis of a mature hen-feathered Campine 

 cock, over one year old. Hem. eos. 



29 Small lymphocyte with minute acidophile granules in the cytoplasm. 

 From the mj^eloid metaplasis drawn in figure 18. 



112 



