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Fig. 2. — Photographs of Escherichia coli by Dr. C. F. Robinow, reproduced by 

 Hillier, Mudd, and Smith (1949); left, stained to show the ectoplasm, in which 

 there are thickenings which tend to be spiral; right, stained to show the large re- 

 peatedly dividing granule in the central body. About x 2,000. By courtesy of Dr. 

 Robinow and of the Society of .\merican Bacteriologists. 



