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  there were no bacilli, no ptomaine poisoning, no diphtheria, and no appendicitis. Rabies was but little known, and only imperfectly developed. All of these we owe to medical science. Even such things as psoriasis and parotitis and trypanosomiasis, which are now household names, were known only to the few, and were quite beyond the reach of the great mass of the people.

Or consider the advance of the science on its practical side. A hundred years ago it used to be supposed that fever could be cured by the letting of blood; now we know positively that it cannot. Even seventy years ago it was thought that fever was curable by the administration of sedative drugs; now we know that it isn't. For the matter of that, as recently as thirty years ago, doctors thought that they could heal a fever by means of low diet and the application of ice; now they are absolutely certain that they cannot. This instance shows the steady progress made in the treatment of fever. But there has been the same cheering advance all along the line. Take rheumatism. A few generations ago people with rheumatism used to have to carry round potatoes in their pockets as a means of cure.