Abstract
With the electron microscope, studies were made of the structure of the bacterial nucleus of sectioned young E. coli prepared with various fixatives which were added to the culture medium or to a pellet of organisms. The nuclear apparatus is seen to vary in appearance with each of the fixatives used. Structural elements seen within the nuclei are similar to the nuclear cores described by others. Cytoplasmic components were also influenced as a result of the various fixatives.
