. The elements of experimental embryology. Embryology, Experimental; Embryology. P 2 BV â ;ih~E "i.:- ss - ~~sc. ---T_w E 'â¢_/^-^-SS K"^--sc ^-'^^.^. 3^ BV SBS EL Fig. 208 The perforation of the operculum in the frog {Rana claniitans). Sections showing the histolysis leading to normal perforation, i, First sign of histolysis (at X). 2, Histolysis well under way; the stratum compactum and stratum spongiosum have become interrupted; there has been a marked invasion of the area by lymphocytes, and the skin in this region is decreasing in thickness. 3, The skin is reduced to the epiderm
. The elements of experimental embryology. Embryology, Experimental; Embryology. P 2 BV â ;ih~E "i.:- ss - ~~sc. ---T_w E 'â¢_/^-^-SS K"^--sc ^-'^^.^. 3^ BV SBS EL Fig. 208 The perforation of the operculum in the frog {Rana claniitans). Sections showing the histolysis leading to normal perforation, i, First sign of histolysis (at X). 2, Histolysis well under way; the stratum compactum and stratum spongiosum have become interrupted; there has been a marked invasion of the area by lymphocytes, and the skin in this region is decreasing in thickness. 3, The skin is reduced to the epidermis, which the fore-limb then ruptures. BV, blood-vessel; E, external epidermis; EL, epidermal lining of branchial chamber; P, pigment; L, lymphocytes; SC, stratum spongiosum; SBS, con- nective tissue; SS, stratum spongiosum; X, site of histolysis. (From Helff, jfourn. Exp. Zool. xlv, 1926.) mones and growth-gradients is shown by studies on regeneration- rate and hormone-susceptibility in birds' feathers.^ Lillie and Juhn, 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 Huxley, Julian, 1887-1975; De Beer, Gavin, Sir, 1899-1972. New York [Hafner Pub. Co. ]
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Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectembryology
