. Journal of morphology. ng axis. The central and peripheralprotoplasm () can be distinguished with the spherule zone between them. 23 Oocyte, 786 x 762ju, cut in the long and polar axes, in about the same stageas fig. 6. At the right the section passes to one side of the stigma (sL). Thespherule zone {) can be seen and in addition many large definitive yolk granuleshave appeared throughout the ooplasm. 24 Oocyte, x mm., cut in long and polar axes. The germinal vesiclehas migrated peripherally out of the central protoplasm, the boundary of which ismarked hz. 25 Oocyte, i
. Journal of morphology. ng axis. The central and peripheralprotoplasm () can be distinguished with the spherule zone between them. 23 Oocyte, 786 x 762ju, cut in the long and polar axes, in about the same stageas fig. 6. At the right the section passes to one side of the stigma (sL). Thespherule zone {) can be seen and in addition many large definitive yolk granuleshave appeared throughout the ooplasm. 24 Oocyte, x mm., cut in long and polar axes. The germinal vesiclehas migrated peripherally out of the central protoplasm, the boundary of which ismarked hz. 25 Oocyte, in long axis, cut in the polar axis and obliqueh to the long photograph was taken from a section nearer to one end of the long axis. Thecentral and peripheral protoplasm and a single spherule zone may be distinguished(more clearly on the right). The definitive yolk granules are especially numerousperipherally. , boundary of the central jirotoplasin. 320 THE BILATERALITY OF THE PIGEONS ECU W. JOURXAU or MORPHOLOGY, VOL. 23, NO 2 321 PLATE 5 EXPLANATION OF FIGURES 26 Oocyte, x mm., cut approximately in the long and polar axes, butmuch distorted in sectioning. The germinal vesicle is ])eripheral. The location ofthe future latebra is indicated by the finer meshwork at the center of the with a one-half inch B. and L. objective, X 40. ;., peripheral protoplasm. 27 Oocyte, in long axis (life), X 40, Leitz obj. no. 2. Cut in polar axis,pcriiendicular to the long axis and compressed from right to left in cutting. Thefollicular epithelium has shrunken somewhat from the theca folliculi, and there isa shrinkage tear near the germinal vesicle. The region of the latebra (lat.) isclearly defined at the center and the layers of yolk granules indicate the rhythmicalformation of yolk. The stigma is shown in cross section at st. 322 « THE BILATERALITY OF THE PIGEONS EGG GEORGE W. PLATE 5
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Keywords: ., bookcentury1900, bookdecade1, booksubjectphysiology, bookyear1912
