We are of opinion that CZURDA and LLOYD did only see the last partof those stadia that characterize the examined process of fusion.One can easily imagine that CZURDA and LLOYD continued theirobservations only long enough to see a fusion follow those stadiawhere the male protoplast was already returned before the mouth ofthe conjugation canal. They mention indeed that the male protoplastnever loses its contact with some part of the conjugation process.In those cases one never sees a female protoplast contracted withoutthe male one being contracted at the same time. One can howeversee a male protoplast contracted without the female one being soalready. Hence their conclusions that the male protoplast shouldcontract first.If any importance is to be attached to the fact that the timesbetween the contraction of the male protoplast and the fusion arerather constant, compared with those between the contraction of themale protoplast and the fusion, it could be that the male protoplastplays a leading part in the process of fusion.