100 
BACTERIOLOGY. 
Tuber¬ 
culin 
treatment 
Public 
health 
measures 
adopted 
in the 
crusade 
against 
tubercu¬ 
losis 
Tuberculin administered in increasing doses, too 
small to cause a reaction and at fixed intervals, de¬ 
velops a tolerance for the poison, and so an immunity. 
This method of treatment is being widely used, while 
the results are not prompt, the consensus of opinion is 
that it exerts a beneficial effect on the course of the 
disease in some cases. 
During the last ten years great efforts have been 
made to check the ravages of the disease; in fact, a 
crusade has been carried on that has become world¬ 
wide. Among the measures that have been advocated 
are the registration of all cases of tuberculosis by de¬ 
partments of health, the establishment of institutions 
sufficient to care for the advanced cases, dispensaries 
where suspected cases may be examined and subse¬ 
quently visited by nurses who instruct the sick in 
the proper way to disinfect the sputum, stools, and 
urine, and the disinfection of all houses occupied by 
tuberculous patients before being reoccupied. More 
general measures, such as better sanitary conditions in 
factories, schools, and dwellings, have been brought to 
the attention of the public, and have created a public 
sentiment that is now bearing fruit. As a result of 
this crusade, it is not too much to expect that the death 
rate from tuberculosis will be materially reduced, and 
that the spread of the disease will be checked. 
The Bacillus of Leprosy. 
The bacillus causing leprosy was found by Han¬ 
ses, a Norwegian, in 1871, in the nodules of leprous 
