In regard to the triffids' creation, some editions of the novel make brief mention of the theories of the Soviet agronomist and would-be biologist Trofim Lysenko , who eventually was thoroughly debunked. "In the days when information was still exchanged Russia had reported some successes. Later, however, a cleavage of methods and views had caused biology there, under a man called Lysenko, to take a different course" (Chapter 2). Lysenkoism at the time of the novel's creation was still being defended by some prominent international Stalinists .
David, Petra, and Rosalind continue on their escape. They now believe Sally and Katherine may be already dead. Michael, still in Waknuk, warns David, Rosalind, and Petra that there is a search party following their trail. Petra continues to communicate with the Sealand woman and finds out that everyone in Sealand can communicate telepathically. As they continue to get farther from Waknuk the land around becomes more wild, and David reckons that they have made it to the Fringes. At the end of the chapter, something falls out of the trees and hits David.