The Description of Death of Mothers
                                         in
                           Wuthering Heights
Examples:
1.   "He told his wife the same story but one night, while leaning on his shoulders, in the act of saying she thought she should be able to get up tomorrow, a fit of coughing took her- a very tight one-he raised her in his arms; she put her two hands about his neck, her face changed, and she was dead...".~ The death of Frances.(chapter 8, page 55)

2. " About twelve o'clock, that night, was born the Catherine you saw at Wuthering Heights, a puny seven months child; and two hours after the mother died,~ The death of Catherine..."(chapter 16, page138)

3.  "Fortunately, its mother died before the time arrived, some thirteen years after the decease of Catherine, when Linton was twelve, or a little more. ~ The death of Isabella." (chapter17, page154)
Analysis:
        Mrs. Bronte died in her early years.   Maybe this fact had some influence on Emily's creating the mothers in Wthering Heights.   We can find out that the mothers in Wuthering Heights all died when they were still young. (See the examples above.)      Mrs. Bronte was weak and often sick.  Moreover she bore a child every year, so she died in 1821, leaving 6 weak and ill children.   We also can find out that all the mothers in Wuthering Heights died after they had given birth of their children.
        It is unreasonable to say that they died because of bearing children, but they died after having given birth to the second generation is indeed the same with the situation of Mrs. Bronte.   There is also something interesting that the description of their deaths is shorter and shorter.   The dwcription of Catherine's death is shorter than Frances, and Isabellas is shorter than Catherine’s.
 
Back to the text