Slide showing three diagrams concerning chromosomes, spindle attachments and anaphase. Slide shows three diagrams concerning chromosomes, spindle attachments and anaphase. Diagrams are labelled a - c. Diagram 'a' also has two arrows labelled S.A. Title below diagrams reads: 'Fig. 6 - a and b: diagrams to show the two alternative modes of behaviour of a chromosome with two spindle attachments at anaphase; c; a diagram of the method of anaphase-separation in one of the germ-line chromosomes in Scaris megalocephala; the numerous spindle attachments are situated so close together that those in one chromatid always go to the same pole.' Late 19th to early 20th century