194 BACTERIOLOGY. 



The lancet-shaped diplococci with the capsule are the 

 diplococci of sputum septicaemia. 



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 pneumouiae ; 

 pneumococcus of Frankel ; diplococcus lanceolatus 

 lancet-formed diplococcus ; meningococcus ; streptococcus 

 lanceolatus Pasteuri. 



b. A form of septicaemia resulting from the invasion 

 of the tissues by an organism frequently seen in the 

 sputum of tuberculous subjects. It is characterized by 

 its tendency to divide into fours. It is the micrococcus 

 tetragenus. 



c. General or local tuberculosis. 



a. SPUTUM SEPTIC^MIA. 



If at the end of twenty-four to thirty-six hours the 

 animal is found dead, we may safely suspect that the 

 result was produced by the introduction into the tissues 

 of the organism of sputum septicaemia above mentioned, 

 which is not uncommonly found in the mouth of healthy 

 individuals as well as in other conditions. 



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

 chief field of activity of the organisms. 



