DR. H. WATNEY ON THE MINUTE ANATOMY OF THE THYMUS. 
1109 
Fig. 11. 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 16. 
Fig. 17. 
Fig. 18. 
Camera lucida and a simple lens X 12^. 
Transverse section of the thymus of human foetus of about the twelfth 
week. 
cc . Concentric corpuscles. 
ct. Connective-tissue which surrounds the gland, and has invaded it and 
divided up the follicle. The cortex is distinguished by its darker 
colour. 
Camera lucida, obj. 8, X 600, oc. III., obj. 9. 
Plasma cells, from medulla of thymus of Calf twenty-eight days old. 
Tissue hardened in alcohol, stained in dahlia (method of Ehrlich, see 
reference No. 79). 
Camera lucida, obj. 7 X 450, oc. III., obj. 8. 
Section of thymus of Calf. The tissue was hardened in bichromate of 
potash, and afterwards in alcohol, and stained in indigo-carmine and carmine, 
in the proportion of one of the former to seven of the latter (method of 
Morris and Shakespeare, see reference No. 87). 
v. Blood vessel showing perivascular sheath, and containing coloured blood 
corpuscles, which are stained green. 
pi. Plasma cells. 
Oc. III., obj. 8, X 400. 
Teased specimens. 
(а) . From thymus of human foetus five months old. 
(б) . From Dog one year old. Connective-tissue network containing 
haemoglobin. 
Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Teased specimen of thymus of Calf seven months old. 
In the lower part there is a concentric corpuscle ; above, a large mass of 
protoplasm containing ( h .) haemoglobin. 
th. Coarse protoplasmic threads, with imbedded nuclei. 
Oc. III., obj. 8, X 400. 
Teased specimen of thoracic portion of the thymus of Calf one year old. 
Mass, probably part of a concentric corpuscle containing large masses of 
haemoglobin ( h . h. h.). 
Camera lucida, obj. 5, X 300, oc. III., obj. 7. 
Teased specimen of thymus of Calf seven months old. 
Concentric corpuscle containing (h.h.) haemoglobin granules. 
p. Yessel-like prolongation. The centre is filled with a mass of proto¬ 
plasm, ending in a rounded extremity. 
Oc. III., obj. 8, X 400. 
Teased specimen of thymus of Calf one year old. 
Nucleated connective-tissue cells of medulla, a long process which contains 
haemoglobin granules ( h .). 
