Archive image from page 123 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 108 DEVELOPMENT OF THE FROG'S EGG [Cii. XI the right half of an embryo has developed from the uninjured blastomere. Half a medullary plate is present along the line of separation of the injured and uninjured halves. Near the posterior end of the half plate, the yolk of the developed half is exposed over a small region and surrounded by half of a blastopore (?). A cross-section of such an embryo shoAvs (Fig. 35, B) that
Archive image from page 123 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 108 DEVELOPMENT OF THE FROG'S EGG [Cii. XI the right half of an embryo has developed from the uninjured blastomere. Half a medullary plate is present along the line of separation of the injured and uninjured halves. Near the posterior end of the half plate, the yolk of the developed half is exposed over a small region and surrounded by half of a blastopore (?). A cross-section of such an embryo shoAvs (Fig. 35, B) that the half plate has essentially the same form as half of the normal medullary plate ; that beneath this half plate a notochord is present forming a rod, round or slightly oval in cross-section; that a small archenteron is present in the developing half, and that a mesodermal sheet is present over the side of the hemiembryo. It is interesting to note that while only half the medullary plate is present, yet the
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