316 COMPARATIVE HISTOLOGY AND PHYSIOLOGY OF THE SPLEEN. 



DESCRIPTION OF FIGURES. 



Plate I. 



Fig. 1. Hilar sheath in spleen of cat x 50. 1. Muscular layer. 2. Connective tissue layer. 3. Artery. 

 4. Vein. 5. Nerve. 



Fig. 2. Hilar sheath in spleen of hedgehog x 60. 1. Muscular layer. 2. Connective tissue layer. 3. Artery. 

 4. Adenoid sheath. 5. Follicle. 



Fig. 3. Follicle in spleen of rook (y^th inch Beck, water-immersion). 1. Arteries. 2. Capillary. 3. Lym- 

 phoid cells. 4. Large cells in follicle. 5. Large cells in pulp. 6. Peripheral muscular layer. 



Fig. 4. Follicle in spleen of hedgehog x 300. (Upper portion of fig. 2, more highly magnified.) 1. Artery. 

 2. Hilar sheath. 3. Lymphoid cells of follicle. 4. Peripheral muscular layer continuous with 

 hilar sheath. 5. Adenoid sheath. 6. Cells of pulp. 



Plate II. 



Fig. 5. Ellipsoid in spleen of ox (y^th inch Beck, water-immersion). 1. Axial vessel. 2. Ground substance 

 with lymphoid cells. 3. Peripheral layer of spindle cells. 4. Microscopic trabeculse. 5. Cells 

 of pulp. 



Fig. 6. Ellipsoid in spleen of dog x 350. 1. Entering artery. 2. Axial vessel. 3. Emergent vessels. 

 4. Capillary channels. 5. Lymphoid cells in ground substance. 6. Surrounding blood-sinus. 

 7. Cells of pulp. 



Fig. 7. Reticulum of pulp in spleen of dog x 350. 1 . Cells of reticulum. 2. Lymphoid cells. 3. Proto- 

 plasmic corpuscles. 



Fig. 8. Reticulum of pulp in spleen of frog with cells containing pigment x 300. 



Fig. 9. Cells of pulp in spleen of tortoise (Zeiss, E.). 1. Giant cells. 2. Protoplasmic corpuscle. 3. Lym- 

 phoid cells. 



Figs. 10 & 11. Giant cells and erythroblasts in pulp of spleen of young pig (Zeiss, E.). 



Fig. 12. Giant cell in pulp of spleen of puppy (Zeiss, E.). 1. Erythroblast apparently within giant cell. 

 2. Erythroblasts around giant cell. 3. Lymphoid cells. 



Plate III. 



Fig. 13. Uninucleated vacuolated cell in pulp of spleen of half-grown rat (Zeiss, E.). 



Fig. 14. Uninucleated vacuolated cells in pulp of spleen of guinea-pig (Zeiss, E.). 



Fig. 15. Giant cell in spleen of an eight months' human foetus (Zeiss, E.). 1. Giant cell, with pyriform 

 nuclei, vacuoles, and mouth-like openings. 2. Erythroblasts. 3. Lymphoid cells. 4. Red blood- 

 corpuscles. 



Fig. 16. Cells of pulp in spleen of an eight months' human foetus (Zeiss, E.). 1. Venule. 2. Special 

 multinucleated vacuolated cell. 3. Young giant cell. 4. Erythroblasts. 5. Red blood- 

 corpuscles. 6. Spindle-shaped fibres, apparently muscular, in wall of vein, some cut obliquely, 

 others transversely. 



Fig. 17. Special multinucleated vacuolated cell in same spleen, showing numerous empty vacuoles (Zeiss, E.). 



Fig. 18. Special cell in spleen of child, showing an erythroblast within a vacuole (Zeiss, E.). 



Figs. 19 & 20. Special cells in spleen of child (Zeiss, E.). 



Fig. 21. Giant cell in spleen of child (Zeiss, E.). 



Fig. 22. Giant cell with budding nucleus in spleen from case of leucocythsemia (Zeiss, E.). 



Fig. 23. Giant cell in spleen of anasmic dog (Zeiss, E.). 



