It is of considerable importance for the proper appreciation of the views advanced in the present essay, to ascertain whether a polar body is or is not expelled from eggs which develope parthenogenetically. I wish therefore to briefly state that I have recently succeeded in proving the formation of a polar body of distinctly cellular structure in the summer-eggs of _Daphnidae_. I propose to publish a more detailed account in a future paper.
NOTE.
From Essays Upon Heredity and Kindred Biological Problems by August Weismann.
