Let the digestive be diversified by reason of the diversity of the humor and of the member; for if the humor is dense it is proper to digest it with a tenuating (i.e. emollient) medicine, just as it is evident that it is proper to digest natural phlegm with simple oxymel. Should it be dense or highly viscous it is proper to digest it with a medicine which accelerates it. Should it be natural melancholia let it be digested with oxymel of squill. Should it be a hot humor18 it is proper to digest it with a cooling medicine; for instance, choler is digested by oxysaccharum. Should the humors be cold it is proper to digest them with medicine which heats them; for instance, phlegm is digested by simple oxymel. Note that should the humors which it is desired to digest be a compound it is proper that their digestive be compounded. Should the composition of the humors be of equal proportions, it is proper to compound the digestives in equal proportions so that there might not be more of one ingredient in it than there would be of another, as is obvious in the case of acidic phlegm and salty phlegm.