. Elementary text-book of zoology. 378 CHORD AT A. because, as in the Up of the blastopore [cf, Amphioxus and Frog), the three layers are there continuous. This thickening gives rise to an opacity called the primitive streak. Fig. 272.—View of the Area Pellucida of a Chick's Blastoderm of about 18 Hours. (After Balfour.) Amniotic Head-fold. Neural Groove. Primitive Groove and Fig. 273.—^View of Chick's Blastoderm about 24 hours. (After Duval.) Head. Mesoblastic Lateral Please note that these images are extracted from scanned page images that may have been digitally enhanced fo
. Elementary text-book of zoology. 378 CHORD AT A. because, as in the Up of the blastopore [cf, Amphioxus and Frog), the three layers are there continuous. This thickening gives rise to an opacity called the primitive streak. Fig. 272.—View of the Area Pellucida of a Chick's Blastoderm of about 18 Hours. (After Balfour.) Amniotic Head-fold. Neural Groove. Primitive Groove and Fig. 273.—^View of Chick's Blastoderm about 24 hours. (After Duval.) Head. Mesoblastic Lateral Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902
