Slide showing hierarchical diagram of the crossing of the 'Rosecomb' and 'Peacomb' varieties of chickens. Slide shows hierarchical diagram of the crossing of the 'Rosecomb' and 'Peacomb' varieties of chickens. Small white label in upper left corner reads: 'Newton & Co. 43 Museum St, London W.C.1.' Newton & Co were manufacturers of lantern slides and had various branches in London. There are three levels on the slide labelled 'P1, F1 and F2'; P1 shows a Rosecomb and Peacomb crossed to produce another variety in F1 which turn results in 4 different possible vareties in F2. Title below image reads 'Fig. 12 - Rosecomb x Peacomb'. Late 19th to early 20th century