This is especially useful in the capture of the majority of the
fur tribe, and particularly the water animals.
The oil may be bought ready for use, or prepared with little trouble.
The common method consists in cutting up fish of any kind, especially
eels, into small bits, putting them in a bottle, and setting the
latter in the full exposure to the sun. It should thus be left
for about two weeks, at the end of which time a rancid oil will
have formed. A few drops of this oil will entice many animals from
surprising distances, often drawing their attention to a bait which
otherwise they might never have scented.