256 BACTERIOLOGY. 



These delicate beaded rods are the bacillus tubercu- 

 losis. The lancet-shaped diplococci with the capsule 

 are the micrococcus lanceolatus. 



FIG. 55. 



Tuberculous sputum stained by Gabbett's method. Tubercle bacilli seen as 

 red rods ; all else is stained blue. 



The cocci grouped in fours are the micrococcus tetra- 

 genus. 



INOCULATION EXPERIMENT. Inoculate into the 

 subcutaneous tissues of a guinea-pig one of the small 

 white caseous masses similar to that which has been 

 examined microscopically. If death ensues it will be 

 the result of one of the three following forms of 

 infection : 



a. Septicaemia 1 resulting from the introduction into 

 the tissues, of an organism frequently present in the 

 sputum. It exists under the various names : micro- 

 coccus of sputum septicaemia ; diplococcus pneumonia ; 

 pneumococcus of Frankel ; meningococcus ; strepto- 

 coccus lauceolatus Pasteuri ; micrococcus lanceolatus ; 



1 Septicaemia is that form of infection in which the blood is the chief field 

 of activity of the organisms. 



