THE NATURE OF THE AMERICAN SWINE PLAGUE. 453 
where the swine plague exists, and any stray dogs seen in or near 
the infested pens or runs should be shot. 
6. Owners of hogs should be instructed (or, perhaps, forbidden) 
not to place new and healthy swine into hog pens or runs in which 
swine plague had existed at any time during the previous twelve 
months, and only then when all the hay or straw that may have 
been stacked in such a hog-yard or run had been consumed by 
other animals, and any refuse remaining had been completely 
burned up. 
Any pens, sheds or stables in which or under which diseased 
hogs have been, must have been thoroughly cleaned out, and the 
contents of such pens or sheds completely burned up. Stables 
should really be so situated that the hogs could not possibly crawl 
under them, or any drainage from the hog-pens or yards run 
under them. When such has been the case, however, the stable 
should be raised, the refuse under it removed and burned, the 
bottom of the stable white washed (to which corrosive sublimate 
1 to 500 parts had been added); the earth forming the bottom or 
under the floors of such pens or stables should be dug out to the 
depth of at least a foot, and then spread out in a thin layer over 
the hog-yard or run; the hole should then be filled with fresh 
earth. (It would be best to securely wall in the ground under a 
stable after such a procedure, so that swine could not get under it 
in the future and to provide for the water from the swine-pen or 
yard to drain in some other direction than under such a stable.) 
If such hog-pens or sheds have plank bottoms, the same should be 
removed and at once burned (this should be done upon the ground 
of the hog-yard when possible). When such pens or sheds hare 
no plank bottoms, the lower boards of their sides should be re¬ 
moved and burned, the remainder should be whitewashed as 
above, three times within a period of three months. 
The ground of the hog-yard or run should be plowed up and 
exposed to the air, and then harrowed tine when dry, three times 
within a period of three months after all diseased or exposed 
swine have been removed, or after thirty days had elapsed from 
the time all symptoms of illness had disappeared from the hogs, 
if any remained. (It will be readily seen that in most cases it 
