The next proposition I would ask you to consider is this: The presumption
always is that every noxious agent, including medicines proper, which
hurts a well man, hurts a sick one. [ Note B.]
Let me illustrate this proposition before you decide upon it. If it were
known that a prize-fighter were to have a drastic purgative administered
two or three days before a contest, or a large blister applied to his
back, no one will question that it would affect the betting on his side
unfavorably; we will say to the amount of five per cent. Now the drain
upon the resources of the system produced in such a case must be at its
minimum, for the subject is a powerful man, in the prime of life, and in
admirable condition. If the drug or the blister takes five per cent.
from his force of resistance, it will take at least as large a fraction
from any invalid. But this invalid has to fight a champion who strikes
hard but cannot be hit in return, who will press him sharply for breath,
but will never pant himself while the wind can whistle through his
fleshless ribs. The suffering combatant is liable to want all his
stamina, and five per cent. may lose him the battle.
All noxious agents, all appliances which are not natural food or stimuli,
all medicines proper, cost a patient, on the average, five per cent. of
his vital force, let us say. Twenty times as much waste of force
produced by any of them, that is, would exactly kill him, nothing less
than kill him, and nothing more.
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