PLATE 11 
EXPLANATION OF FIGURES 
43 Three successive sections showing the entire egg nucleus of an egg from 
which the spermatozo6n was entirely removed by centrifuging. Both polar bodies 
formed. Fourteen chromosomes indicated. History: Centrifuged 7200 revolu- 
tions in thirty-seven seconds, forty-two minutes after insemination. Preserved 
sixty-five minutes later. 
44 Three successive sections showing the entire egg nucleus of an egg from 
which the spermatozoén was entirely removed by centrifuging. The first polar 
body was not formed in this case, and a monaster arises around the egg-chromo- 
some group. History same as fig. 43. 
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