slaughter of reacting animals under the supervision of federal in- 
spectors. The loss in such cases falls directly on the farmer, since 
there is no provision for compensation. A copy of the agreement 
now in use is appended.® Since such work was begun, and up to and 
including June 30, 1909, 2,010 animals have been subjected to primary 
tests. Of these, 201 have reacted. Of those not reacting to the first 
test, 1,237 have been retested and 60 reacted. All cattle tested have 
been duly tagged, in accordance with the terms of the agreements 
that have been signed. 
The identification of tagged cattle is, of course, easy, and therefore 
animals that have been tuberculin tested are thereafter easily recog- 
Farm oC. — - Date~. -....190 
Location...... .. Va., Md., D, C. 
Color. — .... 
Markings 
— ...i nspector. 
Fig. 66. — Bertillon identification applied to cattle. 
nized. There is, however, no provision of law that authorizes tag- 
ging. and not infrequently difficulty is experienced in identifying 
and following up cattle condemned by the inspectors of dairy farms 
merely on the basis of physical examination. Such a cow, if found 
later on the dairy farm on which it was originally condemned, could, 
in many cases, be identified without difficulty. But if she had been 
transferred to any other farm she was less likely to attract attention 
and even if she did identification was not always easy. To minimize 
the difficulty of identification, the health department applied to dairy 
0 See page 797. 
