. A manual of elementary zoology . Zoology. A B C D FlG. 368.âStages in the gastrulation of the frog's egg. The egg is seen from the lower, white pole, which faces towards the future hind end of the animal. /./'/., T,ip of the blastopore : , yolk plug. the two layers, but by an overgrowing of the epiblast over the yolk cells. When this process begins, the black epiblast and the white yolk , a cells each form half the outer surface of the blastula, Dastrulatlon. , â , ,, , ,1,1 111 j tm whirli floats with the black side uppermost. The epiblast grows downwards over the surface ol the yolk re

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. A manual of elementary zoology . Zoology. A B C D FlG. 368.âStages in the gastrulation of the frog's egg. The egg is seen from the lower, white pole, which faces towards the future hind end of the animal. /./'/., T,ip of the blastopore : , yolk plug. the two layers, but by an overgrowing of the epiblast over the yolk cells. When this process begins, the black epiblast and the white yolk , a cells each form half the outer surface of the blastula, Dastrulatlon. , â , ,, , ,1,1 111 j tm whirli floats with the black side uppermost. The epiblast grows downwards over the surface ol the yolk rells, narrowing. 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 Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920