...precisely the origin of the gastrula itself ; to tahe as a starting-point not the two-layered gas trn la, but the ovum. The "gastrula" cannot be taken as a...body, but also by tracing out the cell-lineage or cytogeny of the individual blastomeres from the beginning of development ; and I am convinced that...

...stages, and the desirability of taking as a starting-point not the two-layered gastrula but the undivided ovum. "The 'gastrula' cannot be taken as a starting-point...body, but also by tracing out the cell-lineage or cytogeny of the individual blasto meres from the beginning of development." The second of the causes...

...stages, and the desirability of taking as a starting-point not the two-layered gastrula but the undivided ovum. "The 'gastrula' cannot be taken as a starting-point...relationship to the adult body, but also by tracing out tlte cell-lineage or cytogcny of the individual blastomcrcs from the beginning of development." The...

...the sexual and asexual modes of development in Tunicates, Bryozoa, Worms, and Coelenterates." . . . " The relationship of the inner and outer layers in...adult body, but also by tracing out the celllineage or cytogeny of the individual blastomeres from the beginning of development." In stating what is called...

...of the sexual and asexual modes of development in Tunicates, Bryozoa, Worms, and Ccdentcratcs." ..." The relationship of the inner and outer layers in...adult body, but also by tracing out the celllineage or cytogeny of the individual blastomeres from the beginning of development." In stating what is called...