Archive image from page 131 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 112 THE DEVELOPMENT OF THE CHICK tion of the first somite was marked immediately after the appearance of the first cleft with a delicate electrolytic needle which left a permanent scar. The eggs thus operated on were closed up and permitted to develop to a stage of from 10 Pr'a. ' J/.d- h t iC- -au. ep.

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