This is the full form of the sentence:
Catherine was too excited to drink any tea and Mr Edgar was too angry to drink any tea.
(18 words - long, dull and repetitive)
This is the original sentence:
Catherine was too excited, and Mr.Edgar too angry to drink any tea.
(13 words - much neater, more elegant and more interesting to read).
The verb 'was' and the phrase 'to drink any tea' refers to both people, so there is no need to repeat them.
At 107,945 words, Wuthering Heights is long enough, so Ms Bronte saved words where she could :)