ISO CARL RICHARD MOORE. 



EXPLANATION OF PLATE. 



FIG. la. Curve of fertilization following butyric acid treatment. The ordi- 

 nates represent percentages of fertilization as measured by cleavages, and the 

 abscissae the length of exposure to butyric acid in seconds. The curve is com- 

 pleted by Fig. ib. 



FIG. i&. Completion of curve of fertilization following butyric acid treatment. 

 For first part of curve see Fig. la. 



