238 ELIOT R. CLARK AND ELEANOR LINTON CLARK 
IS 
B 
Fig. 8 Shows a group of connective-tissue cells before (A) and immediately 
after (B) the injection of croton oil. The globule (O. G.) was inserted proxi- 
mally to these cells. The position later occupied by the oil globule is dotted 
in the first sketch. The same cells are shown in both drawings (see numbers). 
The cell processes become shorter and thicker and the whole region shrinks. 
The increase in anastomoses between the processes of the different cells shown 
in the sketch made after the injection is apparent rather than real, since in the 
normal tadpole many of the branches of the processes are too fine to distinguish 
without the oil immersion. 400. 
