. Analysis of development. Embryology; Embryology. ^m Fig. 100. Fig. 99. Induction of neural structures and eye with lens, obtained by implantation of heat-killed anterior medullary plate into the blastocoele of an early gastrula of Triturus (from Holtfreter, '35e). Fig. 100. Induction of a secondary embryo obtained by implantation of a piece of boiled human thyroid gland into the blastocoele of an early gastrula of Triturus. Notice neural tube, notochord and otocysts in b. (From Holtfreter, '34b.) two experimental modifications (Holtfreter, '33e): (1) the heat-killed tissues were sand- wiched
. Analysis of development. Embryology; Embryology. ^m Fig. 100. Fig. 99. Induction of neural structures and eye with lens, obtained by implantation of heat-killed anterior medullary plate into the blastocoele of an early gastrula of Triturus (from Holtfreter, '35e). Fig. 100. Induction of a secondary embryo obtained by implantation of a piece of boiled human thyroid gland into the blastocoele of an early gastrula of Triturus. Notice neural tube, notochord and otocysts in b. (From Holtfreter, '34b.) two experimental modifications (Holtfreter, '33e): (1) the heat-killed tissues were sand- wiched between two sheets of isolated pro- spective epidermis from an early gastrula; (2) pieces of prospective epidermis were loosely placed upon the dead tissues. In both cases, voluminovis inductions were obtained in the explants representing brainlike forma- tions (Fig. 101) which were sometimes ac- companied by mesenchyme, melanophores, or an olfactory placode. Graded inactivation of neural inductors by heat was as a rule expressed in three inter- related phenomena: relative frequency, vol- ume, and organological complexity of the induced structures. If large enough, the in-. 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 Willier, Benjamin H. (Benjamin Harrison), b. 1890. Philadelphia, Saunders
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Keywords: ., bookcentury1900, bookpublisherphiladelphi, booksubjectembryology
