Doctors have always thought, it seems, that the female body is more susceptible to illness than the male. Ancient medicine founded this dogma on the doctrine of elementary qualities, in attributing to woman a cold and humid constitution. As heat is the principal instrument which nature uses to produce the forces of the body and to maintain them, it must be lacking in woman, as is proved by her weakness, the softness of her limbs, her lack of external sexual organs and the crudeness of her menstrual blood. If the Aristotelians and the Galenists diverge, in the Renaissance and in the XVIIth century, about the nature—fertile or not—of the “female seed,” they agree to pledge the female body to illnesses. Such a predisposition is explained by the female constitution: its coldness and its humidity, as well as retaining women's strength badly, contribute to giving them a “soft, slack body, of rare texture,” little suited to letting the body fluids, of which it is full, circulate correctly; their blood, corrupted by humidity, instead of being properly heated like it is in men, accumulates, blocks up the too small blood-vessels and causes all the illnesses of which they are the habitual victims. To this it is necessary to add the pathogenic importance of the womb, “a part of the body so sensitive and so easily upset, that its least indisposition causes an infinity of strange and almost unbearable evils.” The indispositions which affect this part of the body are always in relation to humidity or dryness, that is with “the two excrements” which it receives: sperm and menstrual blood. Whether, insufficiently impregnated by the virile liquor, “it mounts to the liver and other higher parts of the body to suck humidity from them until it becomes moist,” or it retains for an abnormally long time the seed, which decays inside it; or the periods are suppressed, or on the other hand they are produced too often; all womens illnesses are a question of impeded or excessive discharge.