Abstract
The effect of sarkomycin upon the spermatocyte division of grasshoppers, Oxya yezoensis and Podisma sapporense, was observed by phase microscopy. The course of abnormal division was followed successively in a single cell from metaphase to telophase. Generally, sarkomycin damages the chromosomes at metaphase. The chromosomes show stickiness and coalescence under the iufluence and the cells are blocked at metaphase. When the effect is not very powerful, the behavior of the mitochondria remains unaffected, and the formation of an anuclear bud is induced.
