The elements of Embryology (1889) The elements of Embryology elementsofembryo00fostuoft Year: 1889 78 THE SECOND DAY. [chap. for some little time their line of junction (Fig. 23). The open medullary groove of the first day has thus become converted into a tube, the neural canal, closed in front, but as yet open behind. Even before the Embryo of the Chick between thirty axd thirty-six hours, VIEWED FROM ABOVE AS AN OpAQUE ObJECT. (Chromic acid preparation.) /.6f front-brain : mh. mid-brain ; hind-brain ; optic vesi- cle ; auditory pit; vitelline vein ; mesoblasti

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The elements of Embryology (1889) The elements of Embryology elementsofembryo00fostuoft Year: 1889 78 THE SECOND DAY. [chap. for some little time their line of junction (Fig. 23). The open medullary groove of the first day has thus become converted into a tube, the neural canal, closed in front, but as yet open behind. Even before the Embryo of the Chick between thirty axd thirty-six hours, VIEWED FROM ABOVE AS AN OpAQUE ObJECT. (Chromic acid preparation.) /.6f front-brain : mh. mid-brain ; hind-brain ; optic vesi- cle ; auditory pit; vitelline vein ; mesoblastic somite; line of junction of the medullary folds above the

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