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This chapter studies blood where there has been great popular awareness of its importance, both ensuring it functions properly as a vital fluid for the body and due to the alarm that its presence causes if unexpected disorders occur. The different procedures to clean and thin that liquid by bloodletting are described. Diabetes, popularly known as “blood in the sugar” is covered in a section, as is anaemia. The text also considers nose bleeds and the benefit or risk that people attribute to them. The causes of and remedies used for haemorrhoids and varicose veins round off the content of this part of the work.

Blood is considered to be the element most closely linked to life, regulator of the state of health and also, when its balance is affected, a cause of illness and death. As the saying goes: