BACILLUS TUBERCULOSIS 



353 



obtain good and copious growth it is necessary to keep the 

 tubes capped from the outset, and in this way I have 

 obtained very copious growths in alkaUne broth, to which a 

 piece of boiled white of egg is added. In such tubes the 

 broth kept at 37° C. remains clear for four to five days, the 

 minute floccuH and granules appear at the bottom and along 



©\ '^ 



Fig. 138. — From .\ Section through the Kidney of a Rabbit dead op 

 Aktimcial Tuberculosis. 



a. F,lood-ves.stl filled with ca.seous matter, and in it numerous tubercle-bacilli. 

 /'. Nuclei of cells of the tuberculous new growth. 

 c. Capillary vessel in cross section. 



Magnifying power 700. 



the wall of the tube where it is in contact with the broth ; 

 after a fortnight the growth is abundant, and on shaking the 

 broth is made turbid by the numerous flocculi. On potato 

 moistened with broth it is likewise possible to get growth. 

 Temperatures between 36° to 38° C. are most favourable 

 for the growth ; below 30° or above 42° C. no growth can 

 be noticed. 



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