What is the "perfect state" Waknuk is trying to acheive as described in Chapters 5-9 of The Chrysalids?
In The Chrysalids by John Wyndham, the land of Waknuk is devoted to a pure land that is deviation free. The world as it had once been know had been destroyed by cataclysmic event--probably a nuclear holocaust--resulting in bizarre and sometimes dangerous mutations. Waknuk pledges to protect mutation-free normalcy and destroys mutations in whatever form they may take, whether in plants, animals or humans. In Chapters 5 through 9, Waknuk at first celebrates that there have been no new deviations uncovered; a "Purity Record" is set.
Then, in an ironic set-up juxtaposed to the purity record, Sophie is inadvertently discovered when on an fishing outing with David. David is the son of the ruling patriarch of Waknuk and Sophie is his friend who has a mutation of six toes. In the tragedies that ensue, a boy is hit on the head so Sophie can escape to her home; Sophie and her family flee to escape detection; David is cruelly punished. In addition, David's aunt, his mother's sister, reveals that her new baby is a deviant and will never pass certification as "Normal." Her attempts to have her baby fraudulently certified end in her death and her babies disappearance. This is all to show that the perfect world that Waknuk is striving to create is built upon the bones of the dead who have been ironically sacrificed to perfection.