DR. H. WATNEY ON THE MINUTE ANATOMY OF THE THYMUS. 
1113 
Fig. 45, A, B, C. Epithelioid cells, some showing nuclei, others containing 
smaller or larger granular masses. 
va. Vacuolated cells, containing granular mass. 
Fig. 45, A, gr. Granular cell containing two nuclei. 
g. A cell containing a nucleus and a small granular mass. 
Fig. 46, A, B, C. Granular cells, which are more or less vacuolated. 
Fig. 46, D. Granular cell with two nuclei and containing a large vacuole. 
Fig. 46, E, Multinucleated protoplasm, surrounding a vacuole which contains 
a vacuolated granular cell. 
This is one of the earliest stages of formation of a concentric corpuscle. 
Fig. 46, F. Epithelioid cell which is much enlarged, the protoplasm is very- 
transparent ; the outer edge of the cell is somewhat thickened. 
Fig. 46, G. Multinucleated protoplasm surrounding an epithelioid cell. The 
whole forms a commencing concentric corpuscle. 
Fig. 47. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Very large transparent epithelioid cell. 
From section of thymus of foetal Lamb eleven inches long. The tissue was 
hardened in osmic and chromic acids. 
Fig. 48. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Granular cell with three nuclei. 
From section of thymus of Calf nearly one year old, stained by solution of 
Brazil wood. 
Fig. 49. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Section of thymus of foetal Lamb six inches long. The tissue was hardened 
in osmic and chromic acids. 
In the lower part of the figure two concentric corpuscles are seen ; above 
them, lymphoid and epithelioid cells; and in the upper part of the figure, 
many granular cells. 
go. Commencing concentric corpuscle. 
gr. Granular cell with three nuclei. 
v. Blood vessel. 
Fig. 50. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Section of thymus of foetal Lamb eleven inches long. The tissue was 
hardened in osmic and chromic acids. 
In the lower part of the figure a concentric corpuscle is seen. To the left 
of the figure, two giant cells; to the right, at (cc.) commencing concentric 
corpuscles. 
gr. Granular cells, probably forming a giant cell. 
th. Coarse threads attached to the concentric corpuscles. 
Figs. 51, 52, and 53. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Multinuclear masses of protoplasm, enclosing granular masses. 
7 c 2 
