THE STRUCTURE OF BACTERIA. 

 1. 2. 



Fig. 1. The Structure of Bacteria (after Blitschli). 



1-5 correspond to about 2000-2500 linear magnification, 

 i. A, Chromatiiun Okcnii in optical longitudinal section ; B, 

 in optical cross-section. Killed with alcohol and stained with 

 hsematpxylin after the bacterio-purpurin and sulphur grains have, 

 been dissolved out. The reticular appearance is regarded as the 

 optical expression of a foam-like structure : the central body, c, is 

 more compact than the peripheral layer b; the thickenings at 

 a accord with the view of a foam structure. While the reticu- 

 lum itself stains with the blue color of alkaline haematoxylin, the 

 granules, a, give the violet-red color of acid haematoxylin ; with 

 methylene blue also the granules stain red, the reticiilum blue. 

 According to Biitschli the central body, c, is the nucleus, the 



