Archive image from page 94 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 FROM LAYING TO FORMATION OF FIRST SOMITE 75 section passes through the anterior end of the primitive streak; the ectoderm is greatly thickened (primitive knot); the base- ment membrane is interrupted below, and the lowermost cells are becoming loose. The third section is through a more pos- terior portion of the primitive streak. The proliferation from the ectoderm is more extensive, the cells are looser and are begin- Ent'--

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