Note Z — Chapter XI · DEVELOPMENT OF THE REPRODUCTIVE IMPULSE
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Weissman believes that in each individual, produced by sexual generation, a portion of germ-plasm, derived from both parents, is not employed in the construction of the cells and tissues of the soma, or personal structure of the individual, but is set aside, without change, for the formation of the germ-cells of the succeeding generation.
According to Boveri, the ovum has all the organs and qualities necessary for the development of the foetus, except that its centrosome, which starts segmentation, is in a state of inactivity, while the spermatozoön possesses the active centrosome but lacks the protoplasma or the material by means of which this organ could begin its activity.