Page:Proceedings of the Royal Society of London Vol 60.djvu/383

356 Fig. E.— (i) Diagram of unincubated Blastoderm. (ii) Blastoderm with five Pairs of Mesoblastic Somites.

derm, if placed close to the edge of the blastoderm generally hinders the development of that side. But if placed at some distance from the blastoderm, it is eventually passed by the advancing edge of the blastoderm, and is found within the area opaca, though usually a streak is left between it and the edge of the blastoderm.