Note particularly that there are some of the simples such as scammony, rhubarb, and reuponticum7 which purge choler by means of their attractive force. However, when you desire to administer a medicine of scammony do it in this way: take two or three drams of scammony and pulverize it, but do not break it too fine such as the other spices, for by its subtility and adhesiveness it would penetrate to the recesses of the stomach, and in this way it would be possible for it to do harm. So administer it in the dose we are prescribing later, when it has been compounded in the manner we have told of already.