XL] BACILLUS: PATHOGENIC FORMS. 169 



examination and suitable staining, to contain the typical 

 tubercle-bacilli ; (2) That inoculations with cultures of 

 Toussaint's pure micrococci not containing any tubercle- 

 bacilli did not produce tuberculosis in animals ; (3) That 

 Koch's assertions as regards the constant occurrence of 

 the tubercle-bacilli in the tubercles of animals artificially 

 tuberculised are quite correct ; (4) That material other 

 than tuberculous does not produce tuberculosis, that is 



FIG. 91. FROM A SECTION THROUGH A TUBERCLE OF THE LUNG FROM A CASE 



OF ACUTE MILIARY TUBERCULOSIS IN A CHILD. 



Several alveoli are seen filled with debris ; in the centre of this are numerous nuclei, 

 and amongst them the tubercle-bacilli. Magnifying power about 350. 



to say, that the cases of artificial tuberculosis in guinea- 

 pigs observed by Wilson Fox and Burdon Sanderson, 

 and in the older experiments of Cohnheim and Fraenkel, 

 viz. those in which chronic inflammation and caseation 

 (i.e. artificial tuberculosis) was thought to have been 

 induced by other than tuberculous matter (e.g. by non- 

 tuberculous caseous matter, setons, indifferent substances 



