The venous system radiated from the liver, the seat of nutrition, and the veins carried nutrition via the right side of the heart to the rest of the body. The arterial system originated in the lungs, which 'vivified' the blood, and carried this 'vivification' to the rest of the body via the left side of the heart. The blood did not circulate, but was gradually consumed by the body. Reasonable knowledge of anatomy of limbs, etc., but not of organs, etc. Blood is formed in the heart, phlegm in the brain, yellow bile in the liver, and black bile in the spleen.
Health is seen as a proper balance of the four humours.
All disease is an imbalance of these humours. Treatment of disease is an attempt to rebalance these humours - this might be done by diet, exercise, administering purgatives, diuretics or emetics, or by blood letting. It remains the copyrighted intellectual property of Dr Andrew Gregory and cannot be used elsewhere without his explicit written permission.