The beaver is hunted for its testicles, which are valued for making medicine. When the beaver sees that it cannot escape from the hunter, it bites off its testicles and throws them to the hunter, who then stops pursuing the beaver. If another hunter chases the beaver, it shows the hunter that it has already lost its testicles and so is spared.

If a man wishes to live chastely he must cut off all his vices and throw them from him into the face of the devil. The devil, seeing that the man has nothing belonging to him, will leave the man alone.

The testicles of the beaver are highly valued for medicine. A medicine called Castorium, made from beaver testicles, is good for treating many sicknesses: it helps those who have the "falling sickness" (epilepsy) or "cold evils of the head"; it cures palsy of the tongue and restores speech if placed under the tongue; if mixed in wine with the herbs rue and sage, it relieves general palsy of the body; taken with food or drink it comforts the brain; it can wake a man from the "sleeping evil" by making him sneeze; anointing the head with it promotes sleep; it helps against the venim of scorpions and snakes. Bile that it vomits up is useful for many medicines. Its rennet provides relief from the "decaying disease" (possibly leprosy). Beaver fur contains a liquid that is beneficial to people suffering spasms and trembling of the limbs. A person who is paralyzed can be helped by having wine boiled with beaver flesh kept close; the smell of the beaver itself is also useful for paralysis. Its fat is very useful in ointments.