one of the most important secrets of profitable and successful stock
raising is the prevention of disease; that the agricultural colleges are
doing a great work in helping to teach farmers that there are right and
wrong methods of feeding and caring for animals; that the practice of
sanitation in caring for animals is the cheapest method of treating
disease; and that it is advisable to practise radical methods of control,
when necessary, in order to rid the herd of an infectious disease.

_The ration fed_ and the method of feeding are not only important in
considering the causes of diseases of the digestive tract, but diseases of
other organs as well. The feeding of an excessive, or insufficient quantity
of feed, or a ration that is too concentrated, bulky and innutritious, poor
in quality, or spoiled may produce disease.

_An impure water supply_ is a common cause of disease. A deep well that is
closed in properly and does not permit of contamination from filth, does
not insure a clean water supply if the trough or tank is not kept clean.

_Farm Buildings_.--If stockmen would make a more careful study of the kind
of farm buildings most suitable to their needs, the selection of the
location, the proportions, the arrangement of the interior and the lighting
and ventilation, there would be a great saving in losses from disease, and
the cost of building in many cases would be lessened. Your neighbor's
building that you have taken for your model may not be suitable for your
needs. It may be more expensive than your financial condition permits. It
may be poorly lighted and ventilated and not suited to the site that you
have selected.

_Biological Products_.--There are a number of biological products that may
be used in the prevention and control of disease. Some of these products,