Slide showing diagrammatic drawing of 'egg of the common newt'. Slide shows tinted diagrammatic drawing of 'egg of the common newt'. The left section of the egg is tinten in blue colour. The title below the image reads: 'Fig. 6. Egg of the common newt, Triton taeniatus, constricted with a hair loop some time after fertilisation. (After Spemann, 1919)'. Late 19th to early 20th century