Abstract
A technic of staining bacteria with acid-hydrolysed thionin and dehydrating in freezing alcohol, claimed by DeLamater (1951) to be specific for nuclear structures, to preserve the bacterial cell unaltered and to reveal mitotic spindles in Bacillus, is shown to cause considerable distortion, and to produce stained artifacts, de- rived from the transverse septa of this organism. It is these artifacts which have been confused with mitotic figures by DeLamater.

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