. Journal of morphology . al poitions of the entoderm is an artifact, x 95. Fig. 59. This embryo was operated on thirty-four and one-third hoursafter fertilization, and then incubated for thirty-four hours. The injury,\^riS made in. the center of the dorsal lip at a distance from the posteriormargin equal to about half the width of the needle (see Fig. XVI, a). Pos-terior to the head fold the embryo is normal in every way. x 21. Fig. go. The operation was performed on a freshly laid egg, w^hich wasthen incubated for twenty-six and three-fourth hours. The injury wasmade on the boundary between
. Journal of morphology . al poitions of the entoderm is an artifact, x 95. Fig. 59. This embryo was operated on thirty-four and one-third hoursafter fertilization, and then incubated for thirty-four hours. The injury,\^riS made in. the center of the dorsal lip at a distance from the posteriormargin equal to about half the width of the needle (see Fig. XVI, a). Pos-terior to the head fold the embryo is normal in every way. x 21. Fig. go. The operation was performed on a freshly laid egg, w^hich wasthen incubated for twenty-six and three-fourth hours. The injury wasmade on the boundary between the areas opaca and pellucida, in line withthe axis of the future embryo (see Fix. XVI, l)). There are twenty-fivesections posterior to the injury that show a characteristic primitive streakstructure. X 21. Fig. 61. Transverse section through the injured region of the embryoshown in Fig. 68, PI. X. Just one-half of the embryo has been affected byinjury, x 95. ASTKUI^TION IX THE PiGEONS EgG. J. Thos. Pattersox. Plate 61 Op
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