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1 Peritoneal epithelium of a human embryo of 5 mm. X 750. plinm-gen., urogenital fold; cor.m.9’nph., mesonephric body.

2 Cross-section of the peritoneal epithelium of a 7-mm. human embryo. X 750. gZ., glomeru1us;ms’em'.d., dorsal mesentery; e’th.p12’tn., peritoneal epithelium; cor.ms’nph., mesonephric body.

3 Types of cells in the ovary of a 43-mm. human embryo. X 750.

4 Longitudinal section of the genital thickening of a human embryo of 15 mm. X 200. gem, sex cord; e’th.g., germinative epithelium; re., rete.

5 Seminiferous tubule from an embryo of 190 mm. X 200. 11%., blood vessel; tbl., tubule, because of its contortion is out several times.

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