tliose owners wlio can oiler therefor a guarantee that they are in con- 

 dition to separate the liealtljy animals from those which show a reac- 

 tion. The limitation of the test to young cattle was made for two 

 reasons ; first, because it was seen that the raising of new healthy 

 herds was most important; second, because at that time tuberculin 

 was very dear and the quantity to be consumed was of no slight 

 economic importance. I soon arrived at the conclusion however, 

 that in very many cases it would be far more rational to inoculate 

 the whole herd. From the lirst it was to be assumed that many, 

 especially small herds, would be found entirely healthy. Proof that 

 this was the situation appeared to be not only of great scientific, but 

 also of much practical interest. It could then be assumed that in 

 many cases the number of diseased animals would be relatively 

 small, and if such were the case the owner would often be in a posi- 

 tion to accomplish the work by removing the reacting animals from 

 the others. Indeed in many instances he could quickly secure a 

 healthy herd by the sale of single animals. 



Even when tuberculosis was considerably spread among the grown 

 animals it would be, as a rule, most profitable to learn immediately the 

 exact situation and from the very beginning carry out a complete sepa- 

 ration of the herd into two divisions and, after the example of my 

 Thurebylille experiment, attempt a gradual purifying of the herd. 

 Since the summer of 1893, tuberculin has been prepared in my labora- 

 tory by my assistant, Mr. Stribolt, audits price has consequently been 

 kept very low. Although the law had in prospect only the inoculation 

 of young cattle, conditions have so changed that now, as a rule, the 

 entire herd is inoculated at the start. Sometimes animals selected 

 for early slaughter are, however, omitted. With the endorsement of 

 the government I now furnish from my laboratory (subsidized by the 

 state) tuberculin free of cost for the inoculation of grown animals in 

 those herds in which the testing of young cattle is paid for by the 

 sta'e. This is done when the owner desires a total inoculation and 

 under the condition that he will separate the reacting animals from 

 the healthy ones in the same manner as the law requires for young 

 cattle. For the testing of grown animals the owner must pay the 

 veterinarian according to private arrangements. This work can be 

 done at very low cost in small herds, indeed, in many cases, no 

 separate payment is demanded for the investigation of the grown 

 cattle. The veterinarian is paid for testing the young cattle and 



