n. 18 DR. H. WATNEY ON THE MINUTE ANATOMY OF THE THYMUS. 
Fig. 92. Camera lueida, obj. 7, X 450, oc. HI. obj. 8. 
Teased specimen, from thymus of Dog about two years old. 
Two ciliated epithelial cells. 
Figs. 93 and 94. Camera lueida, obj. 7, X 450, oc. III., obj. 8. 
To illustrate the formation of vessels. 
Fig. 93. From thymus of Calf one year old. 
The vessel is inter-epithelial. 
Fig. 94. From thymus of human foetus, probably three months old. 
The new vessel is intra-epithelial and granular, and is formed from a 
granular cell. 
Figs. 95 and 96. Camera lueida, obj. 7, X 450, oc. III., obj. 8. 
Fig. 95. Section of thymus of Calf one year old. 
The tissue was hardened in chloride of gold and chromic acid. 
A vessel with thickened adventitia. 
Fig. 96. From thymus of Calf one year old. 
Vessel with adventitia composed of more than one layer of cells. 
pe. Perivascular sheath. 
Figs. 97, 98, 99, 100, and 10L Camera lueida, obj. 7, X 450, oc. III., obj. 8. 
From thymus of Turkey seven and a-half months old. 
Fig. 97. Giant cell, whose central part is formed by a granular mass. 
Ic. Lymphoid cell. 
Fig. 98. Teased specimen. 
a. Granular cell. 
Z>, b', b'". Various forms of vacuolated cells, 
c. Cell with haemoglobin granules. 
Fig. 99. Shows part of the medullary portion of follicle. 
Epithelioid cells, showing traces of reticulum between the cells. 
gr. Two granular cells, one of which has four nuclei. 
Ic. Lymphoid corpuscles. 
Figs. 100 and 101. Concentric corpuscles with large central cavity formed by 
vacuolation. 
In fig. 101 individual vacuolated cells are seen. 
Fig. 102. Camera lueida, obj. 8, X 600, oc. III., obj. 9. 
From thymus of Turkey seven months old. 
Shows small epithelioid cells, the lymphoid corpuscles, and the reticulum. 
Fig. 103. Camera lueida, obj. 8, X 600, oc. III., obj. 9. 
From thymus of Pay-fish 4-| inches across. 
The lymphoid corpuscles and traces of the reticulum are seen. 
ea. Large endothelial cell of the capsule of the follicle. 
Figs. 104, 105, 106, 107, and 108. Camera lueida, obj. 7, X 450, oc. III., obj. 8. 
From thymus of Tortoise. 
