DISCUSSION ON CATTLE DISEASES. 223 



Dr. Cressey. A needle in a ha}' mow could undoubtedly be found 

 if sufficient amount of inspection is given to all the ha}*, but it may 

 take an immense time to find it. If the microscope should be ap- 

 plied to eveiy drop of milk, separately, in time we might discover a 

 germ ; but only a few germs would pass into the milk unless the 

 animal is palpably sick. Then the milk is poor, unusuallv blue, 

 not creamy, and liasn't that beautiful complexion that belongs to 

 good milk. But if vou have a tuberculous condition of the udder, 

 then the very glands that produce the milk are discharging their 

 sewage into it and the milk will be what is usually called gargett}', 

 and in this the germ could be easily detected, but not found in good 

 milk. 



Question. Do I understand you to say that pulmonary consump- 

 tion in the human familv is contagious? 



Dr. Cressey. No, not if you mean caseated pneumonia and not 

 tuberculosis. In the various types of phthisical diseases, tubercle 

 may or may not be present. 



Question. Is caseated pneumonia w^hat we call old-fashioned con- 

 sumption that a person will be sick with for a number of years ? 



Dr. Cressey. No, old-fashioned consumption as you describe it 

 is tuberculosis. 



Question. That you consider contagious? 



Dr. Cressey. Yes, sir, every time under favorable conditions. 



Question. Is it contagious from animal to man and from man to 

 animal? 



Dr. Cressey. Experimenters have produced the disease in ani- 

 mals by takins: the virus from man, and mav be transmitted both 

 wavs. 



Question. Do not animals often have a severe cough and not 

 have tuberculosis? 



Dr. Cressey. Yes, in man}' instances. 



Question. How are we going to determine? 



Dr. Cressey. You have got to be pretty sharp as a diaguostican. 



Question. How do you account for the fact that you will some- 

 times see the father and mother of a family and several of the chil- 

 dren die of what we call pulmonary consumption, the old-fashioned 

 disease, and yet other children in the same family will live to a good 

 old age in good health? 



Dr. Cressey. If one generation escapes, the next may not. The 

 good Book says the iniquities of the father shall be visited on the 

 children of the third and fourth generations. 



