Excerpt from The Biological Bulletin, 1910, Vol. 18
During the winter of 1904-05 the writer took up the problem of the oogenesis of Hydra, especial attention being given to the cytological changes involved in the development of the%. The species upon which the work was done was judged to be H. grisea. The animals were found growing in large numbers in a pond near Syracuse, N. Y. The results obtained were sufficiently marked to warrant publication, but the paper has been withheld until some of the points involved might receive confirmation from new material.
In the meantime there have been published two papers bearing upon the same subject: one by Tannreuther ('08) and another by Downing ('08). In general agreement with the results obtained by these two as well as by previous writers, were my own, but in some important particulars they differ widely. For several months past an abundance of sexually reproducing Hydra have been kept growing in the laboratory, and material taken therefrom has afforded ready confirmation of the results previously obtained. These results have been reviewed, and, considerably abbreviated, are here presented essentially unchanged. Some discussion of points suggested in recent papers has been inserted, and those particulars in which agreement with other workers exists have been but slightly dwelt upon.
As above stated, Hydras have been kept growing in the laboratory. Observations on these animals yielded interesting results.
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