120 MICRO-ORGANISMS AND DISEASE. [CHAP. 



bacilli. Koch cultivated these bacilli artificially on mixtures 

 of aqueous humour and gelatine, of gelatine and peptone (i 

 per cent.), salt (0*6 per cent. NaCl), and sodium phosphate 

 in sufficient quantity to just produce an alkaline reaction. 

 The bacilli grow well on this mixture, and by repeated and 

 rapid division form peculiar branched series. 



FIG. 55. FROM A SECTION THROUGH A LYMPHATIC GLAND OF MAN DEAD OF 

 SEPTICAEMIA. 



1. A blood-vessel which at one place is distended by and filled with minute bacilli. 



2. Lymph-corpuscles. 



3. Degenerated lymph-corpuscles. 



Magnifying power 700. (Stained with gentian violet.) 



(b) Bacillus of septiccemia of man. In several cases of 

 human septicaemia I have found in the blood-vessels of the 

 swollen lymphatic glands large numbers of minute bacilli, 



