PLATE 5 
EXPLANATION OF FIGURES 
CUMINGIA 
13 Centrifuged 80 turns at 2 pronuclei stage, killed at once. 
14 Centrifuged 70 turns at late pronuclei, or even before; continued on water 
centrifuged until same eggs were ready to go into 2 cells (about twenty minutes 
on machine). Shows nucleus separated from aster. 
15 Centrifuged 100 turns at 2 pronuclei stage, beginning 35 minutes after 
fertilization, continued on water centrifuge until 2 cell (after twenty minutes). 
This egg polyspermic. 
16 Ditto not polyspermic. 
17 Ditto not polyspermic. 
18 Ditto not polyspermic. 
19 Ditto not polyspermic. 
20 Ditto not polyspermic. 
21 Ditto not polyspermic. 
22 Ditto not polyspermic. 
23 Centrifuged at 11-18; killed at 11-30. A.M. 
24 Egg kept all time on water centrifuge; killed just before dissolution of 
pronucleus. 
