THE POLE DISC OF CHRYSOMELID EGGS. 1 8/ 



of abnormal embryo. When the granules of the pole disc are 

 displaced by the centrifuge, they are said to move en masse, which 

 indicates that they form a structural feature of considerable 

 rigidity. 



While more decisive experiments are needed to clear up this 

 point, the evidence at the present time from the morphological 

 side shows that the granules of the pole disc consist of particles 

 derived from the food stream of the ovum that form an accumu- 

 lation in the protoplasm in its posterior part. 



