580 



VETEEINAEY HYGIENE 



Bearing in mind that perfectly healthy animals are liable 

 to fluctuations of temperature, it is essential that some 

 scale should be laid down as a guide to the observer. 

 Nocard considered a rise of 1-4° F. as insignificant ; one of 

 from 1-4° to 2-5° F. as being only suspicious and requiring 

 retesting at the end of a month ; while a rise of 2-5° to 

 5"4° F. is characteristic of tuberculosis.* 



The use of tuberculin and allied substances excepting in 

 skilled hands should be forbidden. There is nothing to 

 prevent the unscrupulous selling all their reactors to some- 



TIME a-"* <>'^ 9'-'' 1^'*' '5*> 



OF HOUR HOUR HOUR HOUR HOUR 



TrME a'-'' <"> pts la* rs 



OF HOUR HOUR HOUR HOUR HOURI 



TuBERCULOua Curve. Non-Tuberculous Curve 



Fig. 189. — Showing a tuberculous and non-tuberculous Thermometrio Curve 

 after the injection of tuberculin. 



one else. Perhaps the only safeguard to prevent this 

 occurring, is by the manufacturers of these powerful prepara- 

 tions refusing to sell to anyone but qualified persons. 



One other point may be touched upon before closing this 

 section, and that is the possibility of immunising cattle 

 against tuberculosis. McFadyean has shown that it is 

 possible to confer a very high degree of immunity, t and 

 doubtless this important point will be more fully determined 



* Professor Del6pine : ' The Stamping out of Tuberculosis,' Journal 

 of Comparative Pathology, vol. xiv., No. 3, 1901. 



j- Journal of the Boyal Agricultural Society, vol. Ixiil., 1902. 



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