438 



STATE BOARD OF AGRICULTURE. 



The following are cases in paint : 



LOW AGGLUTINATIVE POWER, LOW POTENCY. 



Serum. 



Agglutinative 

 power. 



Mixed serum 16 

 Mixed serum 19 

 Mixed serum 20 

 Mixed serum 22 



Potency. 



Below 1-400 30 cc. did not protect. 



1-400 

 1-400 



2-5 cc. did not protect. 

 25 cc. did not protect. 



I 



Below 1-400 25 cc. did not protect. 



HIGH AGGLUTINATIVE POWER, HIGH POTENCY. 



Serum. 



Potency . 



Mixed serum 48 

 Mixed serum 57 

 Mi.xed serum 58 

 Mixed serum 59 

 Mixed serimi 60 



1-50,000 10 cc. protects. 



1 50,000 15 cc. protects. 



1-50,000 < 10 cc. protects. 



1 50,000 ! 10 cc. protects. 



I 



1 50,000 10 cc. protects. 



A conclusion based upon the above data would be niisleadiuo in 

 that It would aifirm the value of the agglutination test in determining 

 the potency of the Dorset-Nil&s serum. 



The following cases illustrate the possibility of error in estimating 

 l)otency by agglutinative power: 



LOW AGGLUTINATIVE POWER. HIGH POTENCY. 



Serum. 



Potency. 



Mixed serum 28 . 



1-800 I 10 cc. protects. 

 Mixed serum 30 Below 1-400 20 cc. protects. 



Mixed serum 31 . 

 Mixed serum 46. 



1-500 15 cc. protects. 

 1 400 5 cc. protects. 



HIGH AGGLUTINATIVE POWER. LOW POTENCY. 



Serum. 



.Agglutinative 

 power. 



Potency. 



Mixed serum 25. . , 

 Mixed serum 33.. . 

 Mixed serum 34.. . 

 Mixed serum 51 . . . 

 Mixed serum 56.. . 



1 4000 15 cc. did not protect. 

 1 4000 15 cc. did not protect. 



1 2000 



1-12000 



1-2000 



15 cc. did not protect. 

 20 cc. did not jirotect. 

 20 cc. did not protect. 



