"Well," said Fellowes, laughing; "and some even in the profession itself say, that perhaps it might not be amiss if the patient never called in such equivocal aid, and allowed himself to die, not secundum artem, but secundum naturam." "And yet I fancy that, in the sudden illness of a wife or child, you would send to the first medical man in your street, or the next, though you might be ignorant of his name, and he might be almost as ignorant of his profession; at least, that is what the generality of mankind would do." "They certainly would." "But yet, upon your principles, how can it be their duty to act on such slender probabilities, or, rather, mere conjectures, in cases so infinitely important?" "I know not how that may be, but it is assuredly necessary." "Well, then, shall we say it is only necessary, but not a duty? But then, if in a case of such importance God has made it thus necessary for man to act in such ignorance, people will say he may possibly have left them in something less than absolute certainty in the matter of an 'historical religion.'--Ah! it is impossible to unravel these difficulties. I only know, that, if the principle be true, then as men in general cannot form any reasonable judgment, not only on the principles of medical science, but even on the knowledge and skill of any particular professor of it, (by their ludicrous mis-estimate of which they are daily duped both of money and life to an enormous extent,) it cannot be their duty to take any steps in this matter at all. The fair application, therefore, of the principle in question would, as I say, save mankind a great deal of trouble;--but, alas! it involves us philosophers in a great deal." "I cannot help thinking," said Fellowes, "that you have caricatured the principle." And he appealed to me.