If they wish to breed quarrels in an enemy's house, they put the seeds of the _amaltas_ or the quills of the porcupine in the thatch of the roof.

The seeds in the dried pods of this tree rattle in the wind, while the fretful porcupine raises its quills when angry.

Hence the seeds will impart the quality of noise to the house, so that its inmates will be noisy, while the quills of the porcupine will similarly breed strife between them.

The effects produced by weapons and instruments are thought of in the same manner.

We say that an arrow is shot from a bow with such force as to penetrate the body and cause a wound.