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 1500 

 diameters by Zeiss's -^ in. objective. 



Fig. 2. — Zoogloza form of spherical bacteria developed in culture- 

 cell containing blood of leper. X 600 diameters. 



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

 Orleans, April, 1880. X 400 diameters by Becks, £ in. objective. 



Fig. 4. — Leptothrix form of desmobacteria developed in yellow- 

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

 diameters by Becks, \ in. objective. 



