PLATE I. 



PHOTOMICROGRAPHS OF BACTERIA MADE BY GASLIGHT. 



FIG. 1. Streptococcus cadaveris, from a culture in agua coco; stained 

 with fuchsin. x 1,000. (Steruberg.) 



FIG. 2. Streptococcus Ha vaniensis. x 1,000. From a photomicrograph. 

 (Sternberg.) 



FIG. 3. Bacillus cuniculicida Ha vaniensis, from peritoneal cavity of 

 inoculated rabbit, showing leucocytes containing bacilli and free bacilli; 

 stained with fuchsin. x 1,000. (Steruberg.) 



FlG. 4. Bacillus cadaveris, smear preparation from yellow-fever liver kept 

 for forty-eight hours in an antiseptic wrapping (Havana, 1889) ; stained with 

 fuchsin. x 1,000. (Sternberg.) 



Note. All of the above photomicrographs were made with the three- 

 millimetre apochromatic horn. ol. im. objective and projection eye-piece of 

 Zeiss. 



PLATE II. 



PHOTOGRAPHS OF COLONIES (IN ESMARCH ROLL TUBES) AND OF TEST-TUBE 



CULTURES. 



FIG. 1. Colonies of Bacillus leporis lethalis, in gelatin roll tube, end of 

 forty-eight hours at room temperature. x5. (Sternberg.) 



FIG. 2. Colonies of Bacillus coli similis in gelatin roll tube, end of 

 twenty-four hours at 22 C. xlO. (Sternberg.) 



FlG. 3. Stick culture of Bacillus coli similis in nutrient gelatin, end of 

 seven days at 20 C. (Sternberg.) 



FlG. 4. Stick culture of Bacillus intestinus motilis in nutrient gelatin, 

 end of four days at 22 C. (Sternberg.) 



FlG. 5. Stick culture of Bacillus leporis lethalis in nutrient gelatin, end 

 of eight days at 22 C. (Sternberg.) 



FlG. 6. Stick culture of Micrococcus tetragenus versatilis in nutrient 

 gelatin, end of two weeks at 22 C. (Sternberg.) 



FlG. 7. Colonies of Bacillus cuniculicida Ha vaniensis in gelatin roll 

 tube, end of forty-eight hours at 21 C. x 10. (Sternberg.) 



FlG. 8. Colonies of Bacillus coli commuhis in gelatin roll tube, end of 

 forty-eight hours at 22 C. x 10. (Sternberg.) 



