Jonathan Harker's journal ended on the 30th of June, and it is still with him in the hospital, sealed and to be opened and transcribed later by Mina. The entire novel, then, is, to a large degree, held together by Harker's journal, and his observations become instrumental in resolving the mystery of Dracula.
Throughout these two chapters, Lucy's health declines and improves, only to decline again. Constant emphasis is given to the two small wounds on her neck, and the reader must assume, although the author does not state it, that the expansion of the wounds and the decline of Lucy's health is a result of the vampire's repeated bloodsucking.
In addition to focusing on bloodsucking, these chapters include other examples of the Vampire-Gothic tradition. There is Renfield, who howls at noon (Dracula's powers are weakest then), yet Renfield is calm at sunset. There is also the presence of bats, as well as other mysterious "noises." Mainly, however, these chapters are concerned with the transfusion of blood into Lucy. Of course, Stoker is playing on the notion of a lover's life's blood. Recall that Arthur declares, "My life is hers, and I would give the last drop of blood in my body for her." The same thing, in a perverted sense, can be said for Lucy's blood, which is given to her "demon lover," the vampire. The same thing is happening when Dr. Seward gives his blood to his beloved Lucy, and finally, in future chapters, Van Helsing, who has learned to love Lucy as a daughter, will gladly give his blood to save her. Each time, Van Helsing points out that the blood is from a strong, powerful, virile young man, yet he is continually vexed as to how the lady's strength disappears. Of note here is the fact that it was dangerous to give such transfusions, because if the blood wasn't of a matching type, it could have possibly killed her. In emergencies, however, any blood is usually given to a patient if a transfusion will, hopefully, save a life.
