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FIG. 6. SURFACE VIEWS OF THE EARLY STAGES OF THE SEGMENTATION IN A FOWL'S EGG. (A and G after Coste.)

A represents the earliest stage. The first furrow (b) has begun to make its appearance in the centre of the germinal disc, whose periphery is marked by the line a. In J3 } the first furrow is completed nearly across the disc, and a second similar furrow at right angles to the first has appeared. The disc thus becomes divided somewhat irregularly into quadrants by four (half) furrows. In a later stage ((7) the meridian furrows b have increased in number, from four, as in B, to nine, and cross furrows have also made their appearance. The disc is thus cut up into small central (c) and larger peripheral (d) segments. Several new cross furrows are seen just beginning, as ex. gr. close to the end of the line of reference d.


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Foster M. Balfour FM. Sedgwick A. and Heape W. The Elements of Embryology (1883) Vol. 1. (2nd ed.). London: Macmillan and Co.

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The Elements of Embryology - Volume 1 (1883)

The History of the Chick: Egg structure and incubation beginning | Summary whole incubation | First day | Second day - first half | Second day - second half | Third day | Fourth day | Fifth day | Sixth day to incubation end | Appendix

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current16:34, 8 January 2011Thumbnail for version as of 16:34, 8 January 20111,034 × 515 (72 KB)S8600021 (talk | contribs)FIG. 6. SURFACE VIEWS OF THE EARLY STAGES OF THE SEGMENTATION IN A FOWL'S EGG. (A and G after Coste.) A represents the earliest stage. The first furrow (b) has begun to make its appearance in the centre of the germinal disc, whose periphery is marked by