7 April 1852
Went to the Zoo.
I said to Him—
Something about that Chimpanzee over there reminds me of you.
She ironically turns her husband’s theories against him, by likening him to one of the Chimpanzees in the Zoo. Her remark is droll and understated.  Note also that all the nouns are capitalised, implying that his theories are important and revolutionary — yet at the same time ridiculous. She not only deflates the importance of mankind, but also mocks the self-importance of Mr. Darwin. 
 
 This line suggests that the idea which Darwin claimed to be his is actually Mrs. Darwin’s. She is the source of the theory of evolution.
Mrs Darwin