Abstract
The allotment of cell surface and the allotment of cell volume between two daughter cells were observed in unequal division of spermatocytes of the grasshopper, Acrida lata, caused by steep temperature gradient. In applying a temperature gradient through the cell division, coincidence in position between the provisional division plane indicated by the tongue of mitochondria, and the actually formed furrow, has been established (i) by markers attached to cell surface and (ii) by calculated volumes of cytoplasm on the two sides of the planes. On removing a temperature gradient while a cell is dividing, equality is regained as far as the volume of the incipient daughter cells are concerned but territories of the surface once allotted are strictly observed. Unequal division, therefore, involves two different meanings; allocation of the surface, and apportionment of the cytoplasm both of which are dependent upon the development of asters.
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