PLATE 2 
EXPLANATION OF FIGURES 
10 Sagittal section through degenerating taste bud thirteen days after 
operation. Only a hollow shell containing debris of degenerating material is 
left. Similar material lies outside the bud. X 450. 
11 Same as figure 10. > 450. 
12 Sagittal section through denervated barbel ten days after operation. 
Section passes through region above basement membrane of epidermis. The 
invasion of leucocytes is marked along the entire center of the figure. a, large 
pigment cell composed of several smaller masses, two nuclei being present. 
Similar pigment eell at b. X 450. 
13 Sagittal section through denervated barbel fourteen days after operation 
showing taste buds in cross-section. Sense cells entirely replaced by indifferent 
epithelial cells. Mitosis at a, b (compare fig. 19). X 450. 
14 Sagittal section through fully degenerated taste bud fifteen days after 
operation. Site occupied by indifferent epithelial cells. Large amount of pig- 
ment in dermal papilla indicates degenerated nerve. X 450. 
15 Amputated end of normal barbel from same fish as in figures 8 and 9. 
Regeneration extends beyond cartilage. Taste buds normal. X 125. 
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