PLATE II. 



DIFFERENT MODES OF GROUPING. 



From photo-micographs made in Havana and New Orleans ; copied by 

 permission of the National Board of Health. 



FIG. 1. Torula form of spherical bacteria (Micoderma aceti 

 Pasteur) from rotten banana, New Orleans, April, 1880. X 1000 

 diameters by Zeiss's ^ in. objective. 



FIG. 2. Zooglozaform of spherical bacteria developed in culture- 

 cell containing blood of leper. X COO diameters. 



FIG. 3. Mycoderma, from surface of foul gutter-water. New 

 Orleans, April, 1880. X 400 diameters by Beck's \ in. objective. 



FIG. 4. Leptothrix form of desmobacteria developed in yellow- 

 fever urine, exposed in laboratory, Havana, July, 1879. X 400 

 diameters by Beck's in. objective. 



