Finally, she had missed Mr. Candy, the doctor, who had mysteriously disappeared from the drawing-room, and had then mysteriously returned, and entered into conversation with Mr. Godfrey.
Will Mr. Candy be the one who is going to steal the diamond, because of his "mysteriously disappear."
that the loss of the faculty of speaking connectedly, implies of necessity the loss of the faculty of thinking connectedly as well.
This Book was written during a time when people like Paul Broca and Wernicke, were discovering that damage to specific areas of the brain could affect specific functions while keeping most every other function in tact. In fact, it sounds as though Jennings is describing Broca's, or Wernicke's aphasia, both of which, sort of fit Mr. Candy's behavior. If this is the case Candy's memory would be in tact, he would just be having trouble finding the words to express himself.