[16] This distinction between the chromatic and achromatic portions of the mitotic figure is due to Flemming.
[17] The genesis of the spireme thread was first described by E. G. Balbiani in 1876.
[18] “Recherches sur la maturation de l’œuf, la fécondation et la division cellulaire” (Archives de biologie, vol. iv.).
[19] First discovered by Flemming in 1879 and confirmed by Retzius in 1881.
[20] The discovery by Hermann of the central spindle first clearly showed that two kinds of fibres must be recognized in the mitotic figure. Those of the central spindle correspond to the continuous spindle fibres of Flemming (1891) and Strasburger (1884), and the mantle fibres, i.e. half-spindle or Polstrahlen, of van Beneden (1887) and Boveri (1889-1890).
[21] Planter, Watasé, Griffen and others.
[22] e.g. Euglypha (Schewiakoff, 1888), Infusoria (R. Hertwig, 1898). So also Korschelt for Ophryotrocha, and many other cases.
[23] e.g. Bauer, spermatogenic cells of Ascaris univalens.
[24] Cf. also Watasé, Solger and Zimmermann.
[25] This term is due to Boveri (Zellenstudien, ii., 1888, p. 68; Jen. Zeit. xxii.), but it was intended by him to include the region of modified cytoplasm or “centrosphere” often enclosing the centrosome proper, i.e. “centriole” of Boveri.