We may get into moral entanglements; before we know it, we may be in the midst of a struggle between good and evil." Sir Nathaniel smiled gravely.
"With regard to the first question--so far as I know, there are no fixed periods for which a scent may be active--I think we may take it that that period does not run into thousands of years.

As to whether any moral change accompanies a physical one, I can only say that I have met no proof of the fact.

At the same time, we must remember that 'good' and 'evil' are terms so wide as to take in the whole scheme of creation, and all that is implied by them and by their mutual action and reaction.
Generally, I would say that in the scheme of a First Cause anything is possible.

So long as the inherent forces or tendencies of any one thing are veiled from us we must expect mystery." "There is one other question on which I should like to ask your opinion.
Suppose that there are any permanent forces appertaining to the past, what we may call 'survivals,' do these belong to good as well as to evil?
For instance, if the scent of the primaeval monster can so remain in proportion to the original strength, can the same be true of things of good import ?" Sir Nathaniel thought for a while before he answered.
"We must be careful not to confuse the physical and the moral.

I can see that already you have switched on the moral entirely, so perhaps we had better follow it up first.