DR. H. WATNEY ON THE MINUTE ANATOMY OE THE THYMUS. 
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Fig. 82. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
From thymus of Calf twelve days old. 
Three granular cells, attached to newly-formed fibrous-tissue ; the largest 
has a distinctly fibrillated process. 
Fig. 83. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Shaken section of the thymus of Calf nearly one year old. 
Granular cell, whose process is in connexion with a dark reticulum. 
Epithelioid cells are also seen. 
Fig. 84. Camera lucida and simple lens, X 12J. 
From thymus of Dog nine years old. One follicle is shown, divided into 
two parts by invading fat tissue ( F ). 
ce. Five cysts lined by ciliated epithelium. The cysts contain haemoglobin. 
Figs. 85, 86, 87, 88, and 89, demonstrate the formation of ciliated epithelium in the 
thymus of the Dog. 
Camera lucida, obj. 7, X 450, oc. III., obj. 8. 
Fig. 85. From thymus of Dog thirty months old. 
A small giant cell, whose edges are attached to connective-tissue-corpuscles. 
Fig. 86. From thymus of Dog five months old. 
Concentric corpuscle. 
ce. Cyst containing degenerated cells. 
Fig. 87. From thymus of Dog five months old. 
Concentric corpuscle with large cavity. The interior is filled with degen¬ 
erated cells. The border of the cavity is lined with epithelioid cells (ep). 
Fig. 88. From thymus of Dog sixteen months old. 
Two cysts, partially lined by sub-columnar ciliated cells. 
dg. Mass of degenerated cells. 
ep. Epithelioid cells, partially lining one cyst. 
Fig. 89. From thymus of Dog sixteen months old. 
Two small cysts. That on the right is lined in great measure by ciliated 
epithelium. The cyst on the left is lined by ciliated epithelium in its upper 
part, but below is bordered by large epithelioid cells (cp). 
va. Vacuolated and degenerated cells. 
Fig. 90. Camera lucida, obj. 5, X 300, oc. III., obj. 7. 
From thymus of Dog nine years old, showing a row of ciliated cells, which 
line a large cyst. The cells are in more than one layer. Only part of the 
drawing is filled in. 
v. Blood vessel. 
Fig. 91. Camera lucida, obj. 8, X 600, oc. III., obj. 9. 
From thymus of Dog sixteen months old, showing columnar ciliated 
epithelium. 
v. Blood vessel. 
