16 



about twelve months after tlie first, as this strengthens immun- 

 ity and extends the period of duration. Calves thus treated 

 have not reacted to the tuberculin test from five to six years 

 afterwards. 



This method of immunizing cattle has only been in vogue 

 in this country for six years, and in Europe for a little over 

 nine years, yet in both places cattle thus treated have notshown 

 any symptoms of Tuberculosis when slaughtered. 



All calves and cows that are vaccinated should be kept 

 away from tubercular cattle until four months have elapsed, as 

 at the end of this time immunity has usually been established. 



Calves should be fed on Formaldehyde milk. This is 

 made by adding abont fifteen drops of Formaldehyde to five 

 teaspoonfuls of water or milk ; pour into a pail which will hold 

 ten quarts, and milk directly into this pail, 



(This will also be found one of the best methods of treating 

 scours in calves, and if along with the scours you have an 

 unhealed navel the external application of a solution of 1-2500 

 of Formaldehyde to the navel will hasten the cure. If this 

 treatment is employed, be sure that you use Formaldehyde, and 

 not Formalin.) 



The method of using Bovovaccine in animals is by injecting 

 five immune units into the upper third of the cervical portion 

 of the left jugular vein. The site of the operation is to be made 

 as clean as possible, and washed with any good disinfectant 

 agent. The syringe is to be sterilized, as well as the hands of 

 the operator, and the wound made by the hypodermic needle to 

 be washed with the' antiseptic fluid after the withdrawal of the 

 needle, using due care that all air is driven out of the syringe 

 before introducing the vaccine into the vein. The vaccine fluid 

 should be warmed to blood heat before using. 



This vaccine is put up in sterilized glass tubes, a sufficient 

 amount for one dose, and is dispensed by C. Bischoff & Co. of 

 New York, and by communicating with this company we have 

 no doubt that they will supply you with all the literature relat- 

 ing to this most important subject, for we believe that it is 

 important, and that Dr. von Behring has established a means 

 of eradicating Bovine Tuberculosis, and made a great step 



