Slide showing a diagram of hens and cockerels demonstrating mutations resulting in rosecomb and single combs on the birds' heads. Slide shows diagram of hens and cockerels demonstrating mutations resulting in rosecomb and single combs on the birds' heads. The diagram is split into three parts labelled p1, f1, and f2. Title below image reads: 'Fig 6 - Rosecomb and Single (after Darbishire).' In the upper left corner of front pane there is a label titled 'Makers Newton and Co, 43 Mueum Street, London WC1.' Late 19th to early 20th century