It is only now, this late in the novel, that we learn the real reason why Dracula has come to England: his country is "barren of peoples," and England is teeming with numbers of new victims. Since Count Dracula brought with him fifty boxes of earth, one can assume that he was intending to stay in England quite some time.
The central incident of these chapters is the infection of Mina: She has a mark on her forehead, a sign that she is "unclean," that she is "infected" with vampirism. Her teeth have grown noticeably longer and her eyes have grown colder. We are also led to believe, in the course of these chapters, that the pursuers are in perfect control because they remember to arm themselves with all kinds of weapons — even Winchesters for the wolves. In theory, they will be able to track down Dracula's destination as far as Varna. However, in the next chapter, we discover that the Count deliberately misled them, and that instead of Varna, he had his box of earth sent on to Galatz, thus bypassing the awaiting pursuers.
The idea of hypnosis is continued throughout these chapters, as well as in the two remaining chapters, in order to track down Dracula, and once again Mina extracts a promise that if she begins to change into a vampire, she wants to be killed. In preparation she has the Church's burial service read to her. The notion of "euthanasia" would have been a shocking notion to Victorian readers.