In "Dr. Heidegger's Experiment", what is the climax of the story?

The dramatic climax of a short story occurs when the
central conflict is resolved with one opposing force winning over the other. When Dr.
Heidegger gives water from the Fountain of Youth to his guests to restore their youth,
he offers them some advice:

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Before you drink, my respectable old friends . .
. it would be well that, with the experience of a lifetime to direct you, you should
draw up a few general rules for your guidance, in passing a second time through the
perils of youth. Think what a sin and shame it would be if, with your peculiar
advantages, you should not become patterns of virtue and wisdom to all the young people
of the age!

His friends
respond with "a feeble and tremulous laugh" to think that with all their years of living
they would "ever go astray again." They are confident they have learned from all their
mistakes and, having a second chance to be young, they will act far more wisely. The
conflict is established. Will they behave as "patterns of virtue and wisdom" when they
become young again, or will they revert to their former selves? Will they really have
learned from experience, or will their basic natures determine their
actions?

The conflict is resolved when Heidegger's friends
regain their youth and immediately revert to their prior youthful behavior. The Widow
Wycherly becomes flirtatious; Killigrew, Gascoigne, and Medbourne, filled again with
"burning passions" to the point of "madness," fight each other physically for her
attention. It is at this point that the story reaches its
climax:

. . .
they grappled fiercely at one another's throats. As they struggled to and fro, the table
was overturned, and the vase dashed into a thousand fragments. The precious Water of
Youth flowed in a bright stream across the floor . . .
.

The conflict is resolved;
clearly the four old people have not learned from experience or benefited from their
mistakes in life. As a result, the Water of Youth is lost. When they quickly turn again
into their elderly selves, no precious water remains to free them from old age. They are
drawn "far down into the chill and darksome vale of years."