IJ 



be wholly destroyed? The French requirement would mean for 

 many cattle owners nothing less than financial ruin. 



Therefore for milk yielding countries I prefer, for the present, to 

 recommend the less radical method which I have introduced into 

 Denmark. This consists of the following features : First, to inoc- 

 ulate the herd with tuberculin. Second, to separate the reacting 

 animals, as far as possible, from the non-reacting. Third, to kill the 

 evidently sick animals, either at once, or after rapid fattening. Fourth, 

 to rear the calves of the cows wkich react, but otherwise appear 

 healthy or at least only slighlly attacked. Fifth, to remove the same 

 immediately after birth from the infected stable, place them in the 

 healthy division and protect them from farther infection especially 

 from milk feeding. Sixth, to carefully disinfect the stable ; and 

 Seventh, to inoculate with tuberculin the animals of the healthy 

 division once or twice yearly. 



The last precaution is taken to permit the quick removal from this 

 division, of auimals which in spite of jn-evious precautions appear to 

 be infected. 



This method rests upon the assumption, first, that infection is the 

 single cause of tuberculosis, and second, that the germs are hot 

 present everywhere, but that infection is caused by the continued 

 living together through a long period of time with tuberculous cattle, 

 and further by the rearing of calves on raw milk from tubercu- 

 lous cows. 



I venture to advise the rearing of calves from cows which react, 

 but are apparently healthy, because I am convinced that the larger 

 majgrity of such calves are really bom healthy. This conclusion may 

 be drawn from the following figures concerning the age of tuberculin 

 inoculated cattle in Denmark : 



No. of Cattle 

 Per Cent 



Undei'G months 

 healthy reacting 



6,449 



84.5 



1,181 



15.5 



About 1 year 

 healthy reacting 



■,!)88 

 70.6 



About 2 years 

 healthy reacting 



3,325 5,310 3,611 



29.4 59.5 40.5 



Grown 

 healthy veactinj 



12,891 

 50.7 



12,548 



49.3 



The table shows in a perfectly clear way the relative health of the 

 youngest class and the gradual increase of the disease in the follow- 

 ing years. Tuberculosis is thus, as a rule, not a congenital, but an 

 acquired disease. It may be asked. Does then congenital tubercu- 

 dosis have no part in the spreading of the disease? It certainly does, 



