17     A striking fact in corroboration of this is, that whilst previously to the year 1801, when the smooth scarlatina of Sydenham still occasionally prevailed epidemically among children, it attacked without exception all children who had escaped it in a former epidemic; in a similar epidemic which I witnessed in Königslutter, on the contrary, all the children who took in time a very small dose of belladonna remained unaffected by this highly infectious infantile disease. If medicines can protect from a disease that is raging around, they must possess a vastly superior power of affecting our vital force.