Speaking of the 14th century, here are some recipes for treatment of Bubonic plague. The difference with the completely nonsense about gravity, there is evidence for some informed thinking
In this treatise, Ibn Khatima was ahead of scientific discoveries of the 19th and 20th centuries, in relation to the theory of contagion and the need for isolation in case of infection, etc, and he comes close to the types of plagues that modern science considers in its classification, I mean, bubonic pest, pneumonic pest and septicemic pest.
Ibn Khatima speaks of "vapors infected by minuscule organisms" that invade the body, causing disease, and that are transmitted from one to another. And so, he emphasizes in the need for isolation in epidemics as a preamble to the modern theories of the epidemiology (10) and the bacteriological microbiology (11) (12).
Section V of the Tahsil is one of the most newfangled and interesting of the book. In this part, Ibn Khatima exposes his theories about the contagion. According to him, the pest is a very serious disease because it is infectious and contagious. The contact with the patient or any of his equipment and vestments is the main cause of infection, due to –as I said- minuscule bodies that are passed from one person to another through the air they breathe, although we must also consider the willingness of each one and his own defense, reaction and resistance system. Thus, according to Ibn Khatima, the alteration and corruption of air promote the disease and it spreads through contagion (13), and this is a very close thought to modern epidemiology.
It does go off the rails, but there are glimmers of the paths that led to science.