Slide showing 'a diagram to show the shifting of male intersexuality in Hok-replacement-experiments'. Slide shows 'a diagram to show the shifting of male intersexuality in Hok-replacement-experiments'. There are five curved lines, one for Hok D, one for Hok C, one for Hok B, one for Hok A and one for Hok Hok. The number '12' appears on a white label at the back of the slide. Late 19th to early 20th century