69 



Continuing the experiments in another 

 establishment, 7 Durham calves of S 

 months to 1 year old. pure-bred by 

 crossing, and intended for Cattle-Shows, 

 were tuberculined. None shewed reac- 

 tion. Finally 10 sires from tho Experi- 

 mental School of "Las Delicias" (Entre 

 Rijs) were tuberculined, without reac- 

 tion. 



Respecting the proportion in which 

 the disease exists in tillage-cattle, the 

 results ot the experiments carried out, 

 confirms the conclusions arrived at in 

 Chapter 2, under the head of "Foci of 

 Contagion". 



At the National School of "Sacari- 

 tecnia" at Tucuman of the 12 oxen used 

 there ; none shewed diagnostic reaction. 

 The 42 tillage-oxen of the Experimental 

 School of "Las Delicias" were treated 

 by thermo opthalmo-reaction; only two 

 shewed diagnostic reaction. The same 

 proceeding was applied to -the 6 tillage- 

 oxen of the Experimental School of San 



