“…In a normal full-grown pelvis, the shape of the pelvic inlet does not have any direct effect on the mechanism oflabour although Caldwell and Moloy, and d 'Esopo, (1933, 1934, 1938 maintained the contrary for many years. This was countered most clearly by the work of Nicholson and Allen, 1946. (See also the discussion in Chapter 4 of the studies of Young & Ince, 1939;Ince & Young, 1940;Thorns, 1939;Greulich,Thoms &Twaddle, 1939 andKenny, 1944).…”