Hydrops is an error of the unifying force in the entire body, following the change of the digestive force630 in the liver [...] of the nutritive force631 this attractive force is, and the nutritive force completes its work because of these four forces; and when one of them is wanting, then all are astray, as such is the liver on account of the gall bladder; and Averroes says if one force be strong and uncorrupted, the body is in its proper state, without a doubt.