TUBERCULIN 



155 



In cattle there is a marked 

 variation in tlie normal daily tem- 

 perature. A fluctuation of two or 

 even three degrees within 24 hours 

 is frequently found. Cold water 

 when drunk in considerable quanti- 

 ties lowers the temperature from 

 two to four degrees. A temporary 

 excitement usually causes an eleva- 

 tion of from I to 1.5° F. There 

 are also marked variations in the 

 temperature of the same animal on 

 consecutive days. The tempera- 

 ture at 12 noon and 12 midnight 

 are often the same. In some cases 

 the maximum elevation for the day 

 occurs near midnight and on the 

 following day the minimum tem- 

 perature appears at that time. It 

 is not uncommon for the maximum 

 temperature to occur twice in the 

 same day and occasionally several 

 times within the twenty-four hours. 

 There are marked individual varia- 

 tions in the effect of ordinary con- 

 ditions upon the temperature such 

 as food, excitement or tempera- 

 ture of the air. A hot spell causes 

 a rise of two and in some ca.ses four 

 degrees. The average temperature 

 of the animals in three herds tested 

 by Howe and Ryder were 102.5°, 

 102.6° and 101° F. respectively. 



In a well kept Government 

 herd that was tested with tubercu- 

 lin, the temperature of part of the 

 animals was taken hourly for 24 

 and part of them for 16 hours pre- 

 ceding the injection. An examina- 





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tw 



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.--11 



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Av, 



v^ ffAf. 



Fig. 33. Tuberculous spleen 

 from a pig. {Law.) 



