THIRTY-SEVENTH ANNUAL CONVENTION. 183 



President : The Professor is here to answer any and all 

 questions ; do not be afraid to ask even the simplest ones. 



Member: If I had a stable in which tuberculosis animals 

 had been confiened, how would you disinfect that stable? 



Dr. Russell : That brings up one of the most important 

 questions. If you have gotten tuberculosis the barn itself be- 

 comes infected. You must disinfect that barn before it is oc- 

 cupied by another herd, and you have the same conditions that 

 you would have with smallpox or any other contagious dis- 

 ease, the disease is again produced. The only thing you can do 

 in this matter is the same way as in the home, disinfect that 

 building so as to destroy the seeds of this disease. The next 

 question is how can that be done? If your building is tight 

 enough, it is possible to use a gaseous disinfectant, otherwise 

 you must use a liquid disinfectant. There are a wide variety 

 of these disinfectants; most are satisfactory, but they are ex- 

 pensive. My mode of treatment is this : First remove all the 

 loose rubbish, all manure and all material which can be easily 

 removed. Any rotten woodwork must be removed. After this 

 loose material has been removed, then apply to the surface of 

 the soil a wash of a disinfectant made of carbolic acid or cor- 

 rosive sublimate, i-iooo of a grain will kill these organisms 

 in one minute's time. This should be applied around where the 

 head of the animal has been most particularly. In the general 

 interior of the barn apply a solution of milk of lime. It is 

 made by taking lime and slacking it and adding sufficient water 

 and straining through a strainer. By using a spray pump it can 

 be applied thoroughly to the walls and ceilings so as to fill in 

 the cracks even. Generally speaking, the floor and stalls will 

 be the points where there is the greatest accumulation. Out- 

 side of the barn the best agent is the direct sunlight, if it falls 

 upon it, but if it is covered with manure then it does not de- 

 stroy. The danger of the pasture infection is small. This is 

 our mode of thorough barn treatment. 



Member : Do not cattle tested in the spring and then turn- 

 ed out to pasture sometimes recover? 



