PLATE 1 
EXPLANATION OF FIGURES 
1 Longitudinal section of normal earthworm, showing relations of epithelium, 
muscle layers, nerve, digestive tract, and blood-vessels. Heidenhain’s haema- 
toxylin and eosin. %X 107. 
2 Longitudinal section of earthworm killed immediately after section of the 
nerve cord, to show the relation of the cut ends of the cord before the regenera- 
tion process starts. Iron haematoxylin and orange G. X 107. 
3 Longitudinal section of earthworm killed thirty minutes after section of 
nerve, to show early formation of plug and its attachment to the ends of the cord. 
Tron haematoxylin and orange G. X 107. 
