Biological Therapy 



179 



Each lot of Pitman-Moore subcutaneous, triple strength 

 and intradermal tuberculins is carefully standardized for 

 potency by animal inoculation, thus insuring that the desired 

 results will be obtained. In addition to this each lot is most 

 rigidly tested for sterility. 



PITMAN-MOORE OPHTHALMIC DISCS are prepared 

 by precipitating the active principle, tuberculin, contained in 

 the concentrate after which it is subjected to special proc- 

 esses which eliminate all extraneous material. The precipi- 

 tate after proper processing is made into discs suitable for 

 ophthalmic use. These discs are made and retained in such 

 a manner as to prevent undue hardness and to make possible 

 the ability of the discs to dissolve readily when brought 

 in contact with the normal secretions of the eye. These two 

 factors are largely responsible for the desirable results 

 which are being obtained with these discs. 



TUBERCULIN TEST IN SWINE. This is best accom- 

 plished by the intradermal test, which is conducted in the 

 same manner as in cattle. The site most suitable for this 

 test in swine is the outer surface of either ear. The test is 

 quite dependable in this specie of animal when properly 

 applied. 



