228 ELIOT R.. CLARK AND ELEANOR LINTON CLARK 
occupied by the other leucocytes, they too became round and 
motionless like the others. 
Soon after the extrusion of the oil globule, the connective- 
tissue cells on the border of this torn area have all recovered 
their normal stellate form and refractile appearance. They 
begin to change shape and to wander in toward the injured area. 
During this stage the processes of all the mesenchyme cells of 
Fig. 3 Sketch of the same region at 6:30 P.M., May 30th. The oil globule 
was extruded at 3:20 P. M. A mass of opaque material is present at the site 
of injection. The leucocytes have all withdrawn their processes and become 
spherical. Several red blood-cells (r.b.c.) have escaped from the blood-vessel at 
the right of tne field. : 
the vicinity radiate toward the site of injury. During the 
succeeding day the connective-tissue cells continue to move in 
and fill up the gap in the tissue left by the extrusion of the croton 
oil. 
The final repair of the injury and return of the fin to normal 
consumes several days. Figures 4 and 5 show successive stages 
in this process. With the exception of one or two connective- 
tissue cells, which showed an extreme degree of injury and which 
