The location of the chick embryo upon the blastoderm

✍ Scribed by Peebles, Florence

• Publisher: John Wiley and Sons
• Year: 1904
• Tongue: English
• Weight: 804 KB
• Volume: 1
• Category: Article
• ISSN: 0022-104X
• DOI: 10.1002/jez.1400010302

✦ Synopsis

An experimental study of the avian egg has led me to examine the following points : I . T h e location of the embryo in the material of the unincubated blastoderm.

2. T h e direction of growth before, and after the appearance of the primitive streak.

T h e origin of the material from which the later embryo arises.

According to Kopschl this third point has been definitely settled. He concludes that nearly all of the embryo develops from the primitive streak. I quote his own words: "Somit entsteht der Embryo, mit Aussnahme des praechordalen Teils, des Kopfes, durch Umwandlung des Primitivstreifens."

Iz have already mentioned some experiments, and will describe others, in the following pages, which seem to prove that only the trunk and caudal regions of the embryo arise from the material of the primitive streak.

T h e methods used by Assheton, myself, and Kopsch are practically the same, and therefore require little explanation. I have 'Kopsch, Fr. Leipzig, 1902. 2Peebles, F. Relation to the Embryo of the Chick. Ueber die Bedeutung des Primitivstreifens beim Huhnerembryo.