Malariotherapy
At the beginning of the 20th century, patients suffering from syphilis were treated with malariotherapy. Ailing individuals were deliberately infected with malaria to induce fever. Apparently, the high fever was enough to kill temperature-sensitive syphilis bacteria. It is estimated that around 15% of those treated with malariotherapy died from malaria. However, others showed great improvement.
#18 The idea is that of sympathetic (imitative) magic : mices have good teeth, so they are good for ailing teeth... the same kind of "reasoning" is always used nowadays in... homeopathy !
#19 Some trepanated prehistoric patients have survived long enough for the bone to grow again around the opening !
#1 Maybe one was supposed to have masturbated with a handful of cornflakes. That certainly would have made it a lot less fun. (Cream on your cornflakes, anyone?)