. The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis . Mammals; Mammary glands. INCUBATORIAL AREA IN ECHIDNA 29 very soon take their own course. These facts are very clearly illustrated in the series o£ drawings of successive stages represented in Figs. 12a, 12b, 13a, and 13b. Fig. 12a represents a section of primary- primordium in Semen's Stage 51, of which Fig. 11b gave a complete view. The hair. Fig. 12b.—Echidna: Tkansvkkse Section through THE Incubatorial Area OF Semon's Embryo, Stages 51 and 52. Dr, Gland area ; dr, small gland bud. primordia of the surr
. The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis . Mammals; Mammary glands. INCUBATORIAL AREA IN ECHIDNA 29 very soon take their own course. These facts are very clearly illustrated in the series o£ drawings of successive stages represented in Figs. 12a, 12b, 13a, and 13b. Fig. 12a represents a section of primary- primordium in Semen's Stage 51, of which Fig. 11b gave a complete view. The hair. Fig. 12b.—Echidna: Tkansvkkse Section through THE Incubatorial Area OF Semon's Embryo, Stages 51 and 52. Dr, Gland area ; dr, small gland bud. primordia of the surrounding skin,' with the sweat-gland outgrowths now first appearing {sdr), and the first hair buds {ha) within the primary-primordium, are clearly shown. In Stages 51 and 52 (Fig. 12b) there is a further growth of the hair follicles within as well as without the primary-primordium, and likewise. 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 Bresslau, E. (Ernst), 1877-; Hill, James Peter, 1873-1954. London : Methuen & Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksu, booksubjectmammaryglands
