PLATE 3 
EXPLANATION OF FIGURES 
16 Cross-section of denervated barbel sixty days after operation. Normal 
taste buds at a. Nerve at left of cartilage is in fascicles as in normal nerve. 
x 125. 
17 Cross-section of normal taste bud at its distal end. Over a hundred 
‘sense hairs’ are crowded into a compact mass and are surrounded by a whorl of 
epidermal cells. X 450. 
18 Cross-section of normal taste bud at median level. X 450. 
19 Cross-section at normal taste bud at proximal end. Many nuclei of 
sense cells shown. XX 450. 
20 Sagittal section through denervated barbel, showing cross-section of de- 
generated taste buds fifteen days after operation. a, aggregation of epithelial 
cells occupying site of former taste bud; b, pigment in place of taste bud. X 450. 
21 Next section to figure 20. a, dise of epithelial cells replacing bud; b, pig- 
ment replacing bud. X 450. } 
22 Third section from figure 20. a, section through dermal papilla, capil- 
lary with erythrocyte in center; b, germinative layer of epidermis bounding 
dermal papilla. X 450. 
23 Cross-section through denervated barbel fifteen days after degeneration. 
Dermal papillae at a indicate site of former taste buds. Degenerated nerve at b 
(compare fig. 16). XX 200. 
24 Cross-section through newly regenerating barbel 5 mm. in length. Taste 
buds at a. X 200. 
25. Similar to figure 15, but a later stage showing development of taste buds 
in regenerated area at a. XX 125. 
398 
