Scientific racism. Paternity tests. And mass tattooing, just in case of nuclear attack.
Medical authorities wrote about leeches as if they sucked blood out of the goodness of their hearts.
Humans and mosquitoes share a surprising amount of genes and have similar hunger controls.
Leeches are especially helpful when veins are damaged and unable to properly drain blood from extremities, for example, in recently reattached amputations.
Paganini's personal bloodletting kit contains three domed-shape glasses with brass twist spouts and a brass scarification (scraping) tool.