Slide showing two diagrams of 'Head structures induced in a competent ectodermal ball by implantation of living head-organiser.' Slide shows two diagrams of 'Head structures induced in a competent ectodermal ball by implantation of living head-organiser.' The first head is labelled with the following terms: ear-vesicle, foregut, mouth and eye. The second head is labelled with the following terms: neural tissue formed in Triton ectoderm, neural tissue formed from Bombinator implant, tooth papilla, notochord. Title below image reads 'Fig. 148. Head structures induced in a competent ectodermal ball by implantation of living head-organiser.' Late 19th to early 20th century