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With regard to the achromatin spindle, Professor Hartog has shown that the two poles of the spindle are of the same sign, and not of opposite signs as was at first supposed.

These are still united by fibres of achromatin.

In the process of karyokinesis the two centrosomes, i.e. the two poles of the achromatin spindle, repel one another.

This preparation, then, which is produced entirely by diffusion, presents a perfect resemblance to the achromatin spindle in karyokinesis.

We are able to produce by diffusion not only the achromatin spindle, but also the segmentation of the chromatin, and the division of the nucleus.