INOCULATION OF BACILLAR PHTHISIS. 
213 
bacillar action furnish the reason why some tubercles stop and 
limit their growth, and in other circumstances, why the invasion 
becomes so rapid and general ? 
Bacillar Injections in the Peritoneum. —Here the same effects 
are observed, according to the quantity of bacilli inserted. When 
the operation is performed on animals refractory, or but slightly 
subjects to tuberculosis, as the dog, the rat, and white mice, they 
die only after several months, presenting then a very abundant 
eruption of tubercles in the viscera of the abdomen, though very 
few in the lungs. 
These undeniable facts prove even the superiority of the bacil¬ 
lar to the tuberculous infection. And here is another proof: 
rats were fed, during several months, with tuberculous substances, 
without showing any visible effect. Tuberculous inoculations 
also failed. When the injection of the bacillus was made in the 
peritoneum, an extensive eruption of tubercles followed. 
Bacillar Injection into the Veins. —When thoroughly pure 
liquid, free from solid particles, is injected into the blood itself, 
a miliary tuberculosis, more rapid and extended than the spon¬ 
taneous one, is developed. 
EXTERNAL CAUSES. 
External Origin and Internal Development of the Bacillus. 
— I. Parasitic Life. —The bacillus, as demonstrated by experi¬ 
mentation under all its forms, being the only factor of tubercu¬ 
losis, it becomes necessary to inquire into its origin. Whence 
does it come ? Is it from the surrounding media, and is it inde¬ 
pendent of animal or human organism ? If it has an external 
origin—if, for instance, it exists everywhere that there are animal 
or vegetable matters in putrefaction, and if it can live in them 
and produce and multiply its spores, we shall be unable to protect 
ourselves. But fortunately it is not so. The tuberculous bacillus 
is of much slower growth than other bacillse, and only does so in 
the bloody serum and bouillon of meat, while a temperature of 
30° Centi., night and day, is necessary to its development. This 
temperature may continue unaltered for weeks ; but when even 
these favorable conditions exist, which is not always possible, 
