Slide showing two sets of diagrams showing different mutations of Drosophila Melanogaster [fruit fly]. Slide shows two sets of diagrams showing different mutations of Drosophila Melanogaster. Set 1 has diagrams labelled 1 to 6. Part of the description is in German. Images are labelled as follows: '1 - links-normales [female], rechts-normales [male]. 2 - divergent [male]. 3 - dwarf-b [male]. 4 - spineless [male]. 5 - Dichaeta [male]. 6 - Bithorax and glass [male].' Set 2 has diagrams labelled 1 to 8, and the labels are as follows: '1 - vortex [female]. 2 - hairy [female]. 3 - delta [male]. 4 - notch [female]. 5 - beaded [female]. 6 - rudimentary [female]. 7 - curled [female]. 8 - vestigial [female].' Description at bottom of slide, translated from German: 'Pictures 1, 4, 6 and 8 from Morgan, Bridges, Sturtevant 1925; pictures 2, 3, 5, and 7 from Bridges and Morgan 1923.' Late 19th to early 20th century