No. 4.] CATTLE COMMISSIONERS' REPORT. 387 



The prevalence of consumption in the human being is so well 

 recognized that it is not necessary to set down here, at length, 

 any statistics. The mortality of human beings throughout the 

 world from all causes shows of the entire death rate one in 

 every seven is from consumption. While this is the general 

 average throughout the world, statistics show that this rate is 

 greatly increased in special occupations and among special 

 classes of people, and further shows that the denser the i)opu- 

 lation the greater is the percentage of deaths from tuberculosis. 



An excellent table of this sort has been prepared by Dr. 

 Lasneau in the statistics of 662 cities in France, which show 

 that the closer the people are packed together in cities the more 

 frequent is this disease. These tables show the number of per- 

 sons annually dying from consumption out of every one thou- 

 sand inhabitants in cities of diftereut populations as follows : — 



95 cities with less than 5,000 inliabitants, .... 1.81 per cent. 



332 cities of between 5,000 and 10,000 inhabitants, . 2.16 per cent. 



127 cities of between 10,000 and 20,000 inhabitants, . 2 71 per cent. 



60 cities of between 20,000 and 30.000 inhabitants, . 2.88 per cent. 



46 cities of between 30,000 and 100,000 inhabitants, . 3.05 per cent. 



11 cities of between 100,000 and 430,000 inhabitants, . 3.65 per cent. 



Paris, with 2,224,704, inhabitants, 4 91 per cent. 



This table shows that this disease is more frequent where the 

 population is denser, and where, therefore, the inhabitants are 

 subjected to poor sanitary conditions. 



Public Health. 



The danger to the public health from the prevalence of tulier- 

 culosis in our neat cattle is due to the fact that when the flesh 

 or milk from such animals is consumed by man it may, by the 

 introduction of the irerm, transmit the disease. 



Direct experiment with the milk or meat of tul)erculous 

 animals cannot he made upon man, but such, however, have 

 been made upon the lower animal, conclusively showing its 

 infectious character. Among many hundred that have been 

 made the following may serve as an example : — 



Hiershberger inoculated rabbits in the abdominal cavity with 

 the milk from thirty-nine tuberculous cows, in which the udder 

 was sound, and produced tuberculosis in fourteen cases. Bangs 

 inoculated from sixty-three tuberculous cows, selected for their 



