JOURNAL OF MICROSCOPICAL SCIENCE. 
EXPLANATION OF PLATE XXI, 
Illustrating Dr. E. Klein’s Observations on the Structure of 
the Spleen. 
Fic. 1.—Dog’s spleen injected with one tenth osmic acid, and then hardened 
in Miiller’s fluid, showing the structure of matrix of pulp. 
a. Cavities containing lumps of blood-pigment. 
- blood-corpuscles. 
¢. _ Apparent fibres —in reality only ridges of the general 
matrix. 
Fic. 2.—Human spleen hardened in chromic acid. 
a. Venous sinus. To the left of it the wall of a sinus, 
lying in a layer above, is seen ex face. 
Fic. 3.—From the same spleen as fig. 2, showing the structure of the 
matrix of pulp. 
a. Venous cavities of the pulp. 
6. One that contains a budding cell. 
Fic. 4.—From the same spleen, showing the structure of the wall of a 
venous sinus, A being the one, B being the other wall seen in 
profile. 
a. The endothelium bordering the lumen. 
6. Pulp substance. 
Fic. 5.—From the same spleen; marginal part of a Malpighian corpusele. 
a. Matrix. 
6. Budding lymphoid cells. 
All these figures are drawn under Hartnack Oc. IIL; Obj. 
Immersion 10. 
Fic, 6.—From a section through an injected spleen of monkey. 
a. Venous sinuses in transverse section. 
6. Matrix of pulp. 
Oc. IL; Obj. Immersion 10. 
Fie. 7.—1, 2, 3, 4, very large cells of the matrix, containing numerous 
budding nuclei—giant cells. 
a. Matrix of the cells, 
b. Nuclei. 
c. Spaces, 7 containing blood-corpuscles. 
Oc. IIT; Obj. 10 Immersion. 
