. The eggs of mammals . Fig. 2. A late anaphase in the germinal epithelium of the mouse. The plane of division is nearly parallel to the surface of the ovary. (From the American Journal of Anatomy.) According to Allen the tunica albuginea forms ^'from con- nective tissue ingrowth during the absence of ovogenetic proliferation of the germinal ; Allen notes a relatively intact tunica in animals that have had a long period of dioestrus and also a complete or an almost complete absence of young follicles. Cowperthwaite (1925) has criticized Allen's data On the grounds that he gives
. The eggs of mammals . Fig. 2. A late anaphase in the germinal epithelium of the mouse. The plane of division is nearly parallel to the surface of the ovary. (From the American Journal of Anatomy.) According to Allen the tunica albuginea forms ^'from con- nective tissue ingrowth during the absence of ovogenetic proliferation of the germinal ; Allen notes a relatively intact tunica in animals that have had a long period of dioestrus and also a complete or an almost complete absence of young follicles. Cowperthwaite (1925) has criticized Allen's data On the grounds that he gives no demonstration of the presence of meiosis in these presumable new ova. Typical meiotic phenomena in adult ovaries have, in fact, rarely been ob- served. De Winiwarter (1920) noted oocyte formation in the region of the hilum in ovaries of cats shortly after puberty but no such process in the remaining tissue, and Gerard
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