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i 74 Circular N0. 10. "
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. fers upon the animal a more permanent immunity than
A serum alone, it is borne by the animal with greater difficulty  
. l and is attended by a greater number of fatalities, and · yi
p furthermore, unless it is properly controlled is liable to  
‘ i` · result in the establishment of centers of infection in non- l
J infected territory. The Experiment Station discourages the l
  use of the double treatment and will not supply virus to any
? one but recognized veterinarians. - l
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_ PLATE 2. Inoculating small pig in hind flank.