We all know the joy of seeing sicknesses of definite symptoms yield, almost miraculously, to the remedy of like symptoms. We thrill to the triumphs of homeopathy in cholera, in dysentery, in ptomaine poisonings, in pneumonias, in broncho, pneumonias, in hundreds of conditions, trivial and severe. And then! . . . we all come across cases which, after apparent yielding to the seemingly indicated remedy, recur; do less well; finally cease to respond. Why is this?