Explantation of Illustrations. 



The drawings have been rendered by A. B. Streedain from specimens of the 

 liver of normal pigeons. Daylight illumination. Camera lucida, Zeiss apochro- 

 matic objective 8,0mm and compensating ocular 6, were employed for Figure 1. 

 For figures 2, 3 and 4, the same combination was used except that the objective 

 was Zeiss apochromatic oil immersion 2 mm. lens. In reproduction there has been 

 a V-i reduction, the resulting magnification being; in Figure 1, x 225 diameters; 

 in figures 2, 3 and 4, x 863 diameters. All sections were 4 /«. thick. 

 Fig. 1. Shows the general distribution of hemophages giving the Prussian-blue 

 reaction for iron. The absence of such cells in the larger vessels is illus- 

 trated in vessel b). 

 Fig. 2. Shows the relation of the hemophages to the venous capillaries .Hemophage 

 a) displays the characteristic nucleus and two included erythrocytes. One 

 of the erythrocytes is slightly distorted but has normal staining reactions. 

 The other erythrocyte is semi-digested and is represented only by its he- 

 moglobin-free stroma and faintly staining, displaced nucleus A small 

 amount of hemoglobin is seen occupying a vacuole in this hemophage. 

 Hemophage b) contains also the nucleated stroma of a digested erythrocyte 

 and, in vacuoles hemoglobin. 

 Fig. 3. In hemophage a) is a recently ingested erythrocyte which appears normal 

 except for a slight loss of hemoglobin. Hemophage c) shows a relatively 

 slight iron reaction and a reduced cell-body. 

 Fig. 4. Hemophage a) shows a recently ingested erothrocyte with normal staining 

 reactions. Also hemoglobin contained in a vacuole. Hemophage c) ap- 

 pears as a cell intermediate between a normal endothelial cell and the 

 larger hemophages. Its iron reaction is relatively weak. Hemophages d) 

 display an intense iron reaction and contain hemoglobin in vacuoles. He- 

 mophage e) represents a very late stage and is a normal endothelial cell 

 except for the slight traces of iron. 



