THE NUCLEAR CYTOLOGY OF SPORULATION IN BACILLUS MEGATERIUM

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Abstract
Evidence presented indicates that the process of sporulation occurs by the cleavage of multinucleate cells into binucleate cells. The last nuclear division prior to the onset of the proc-ess of sporulation appears to be a typically mitotic one in which three chromosomes can be counted. Subsequent development of a spore occurs around 1 of the 2 nuclei, which remains in the condensed phase. The sister nucleus expands into a typical interphase nucleus in which the chromosomes occur as elongated, beaded threads. It is construed that the interphase nucleus is the actively metabolizing nucleus, and that it supports the cell during the formation of a spore about the condensed sister nucleus. The evidence is further construed to indicate that sporulation in B. megatherium, and probably in related organisms, is a vegetative, propagative one.
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