Figure 1.

Measures of lordosis (top) and number of animals and mounting (bottom) in female and male guinea pigs treated with 3.32 μg of estradiol benzoate and 0.2 mg of progesterone and tested three times, with 3–5 months between tests (the results are from test 1 and test 3). The animals were born to untreated mothers (control females and males) or to mothers treated with testosterone propionate in doses that produced female offspring with unmodified external genitalia (unmodified females) and females with external genitalia macroscopically indistinguishable from a penis (hermaphrodites). No measures of variability were reported in the original article. Figure redrawn from Phoenix et al. (1959) with permission.