Slide showing a chart illustrating results of crosses between impure yellow and pure green seeds. Slide shows a chart illustrating results of crosses between impure yellow and pure green seeds. This chart relates to Mendel's genetic experiments regarding crossing different types of seed. Small white label in the upper left corner of slide reads: 'Newton & Co, 43 Museum St, London, W.C.1..' Newton & Co were manufacturers of lantern slides and had various branches in London. Late 19th to early 20th century