1108 
DR, H. WATNEY ON THE MINUTE ANATOMY OE THE THYMUS. 
NG. Spinal ganglia, 
M. Muscles cut transversely. 
M\ Muscle cut obliquely. 
N'G'. Nerves and ganglia. 
Th. Thymus, showing slight difference between cortex and medulla. 
G. The gills. 
caf. Cartilage supporting gills. 
Fig. 6. Camera, lucida, obj. 2, X 75, oc. III., obj. 4. 
From Calf four days old. Section of follicle. The thymus was injected 
with carmine and gelatine, and hardened in alcohol. 
V. Veins which lie just within the medullary portion. 
V'. Veins passing out of the follicle in the interfollicular connective-tissue. 
ar. Arteries. 
gr. Granular cells. 
cc. Concentric corpuscle. 
Fig. 7. Camera lucida, obj. 4, X 150, oc. HI., obj. 5. 
From Kitten four months old. Section of thymus injected with carmine 
and gelatine, hardened in alcohol. 
M. Margin of medulla. 
d.cl'. Two vessels are seen to penetrate the very large compound concentric 
corpuscle, the central portion of which has fallen out. 
b.g. and ce. The central parts of the individual concentric corpuscles ; they 
are not penetrated by the injection, 
Fig. 8. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Shaken section of thymus of Calf twelve days old, 
The drawing represents the method of double staining by haematoxylin 
granular cells of a brown colour, attached to blood yessel: the nuclei of the 
granular cells and vessels, purple; lymphoid cells, deep purple. 
Fig. 9. Camera lucida, obj. 8, X 600. oc. III., obj. 9. 
From young Calf; section of cortical portion of thymus, hardened in 
chromic acid and then in alcohol. The specimen was stained with indigo- 
carmine and carmine (method of Morris and Shakespeare, see reference 
No. 87) in the proportion of one of the former to ten of the latter. The 
reticulum is blue-green. The lymphoid corpuscles are of a carmine colour. 
Fig. 10. Camera lucida, with upper part of No. 2 lens, X about 36. 
Section of a follicle of the thymus of Calf one year old. The thymus was 
hardened in chloride of gold and chromic acid. 
ct. Connective-tissue surrounding the follicle, and penetrating into the 
interior, cutting off portions of the cortical-tissue. 
ct'. One of the invading processes of connective-tissue. 
F. Fat in the invading connective-tissue. 
