As the cell is elongating, the axial filament is seen apparently
growing out of the nucleus. I do not mean to say that it grows out
of the nuclear substance, but in almost every cell observed, where
the axial filament was incomplete, there was rather a large mass of
chromatin gathered at the place where the axial filament was attached
to the nucleus. It may be that the smaller one of the extra-nuclear
bodies in figs. 4, 7 and 9 is a centrosome which is passing to the
equatorial region of the nucleus, where it later develops the axial
filament. As already noted, the axial filament does not pass through
the nebenkern, but only over its surface. Fig. 29, _a_, _b_, and _c_,
shows different cross-sections through the elongating cell. In _b_
the axial filament was cut at an angle.