EXPLANATION OF PLATES 
ABBREVIATIONS WHICH APPLY TO ALL FIGURES 
chr isolated pigment cell; 
ct embryonic cell exhibiting inde- 
pendent movement in the lymph ; 
cut cuticular border of epidermal cells; 
epidermis; 
ey.c epidermal cells in lymph prepara- 
tion; 
ery red blood corpuscle; 
Jen opening found in mass of trans- 
planted tissue; 
jil hyaline protoplasmic filament 
stretching between two cells or 
cell masses; 
gn ganglion; 
I thin layer of cells formed by 
spreading of transplanted tissue ; 
rue medullary cord; 
mes mesenchyme ; 
ms main mass of transplanted tissue; 
niy myotome, the suffix denoting the 
serial number of the segment; 
nhl neuroblast; 
nf nerve fiber; 
npl protoplasmic end of growing nerve ; 
j)l.fr hyaline protoplasmic fringe, often 
seen in transplanted epidermis; 
Ihr fibrin threads. 
