Abstract
The kinetic behavior of the mitochondria in the course of cell division was successively traced in fresh grasshopper (Podisma sapporense) spermatocytes with the use of a phase-contrast microscope, under both normal and induced abnormal conditions. In every case of either normal or abnormal condition of the chromosomes observed during the period from metaphase to telophase, the mitochondria always showed their characteristic behavior in the course of division, and the cleavage furrow is formed without exception in close connection with the characteristic behavior of the mitochondria. The evidence here presented seems to indicate that the mitochondria play a significant part in the formation of the cleavage furrow in cell division.

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